I'm seeing the same problem. Debug information below.

LIBVA_MESSAGING_LEVEL=2 snap run chromium
[20382:20382:0821/200854.560443:ERROR:sandbox_linux.cc(374)] 
InitializeSandbox() called with multiple threads in process gpu-process.
[20548:13:0821/200904.074169:ERROR:batching_media_log.cc(38)] MediaEvent: 
{"error":"{\"causes\":[{\"causes\":[],\"data\":{},\"stack\":[{\"file\":\"../../media/filters/decrypting_video_decoder.cc\",\"line\":53}],\"status_code\":264,\"status_message\":\"\"}],\"data\":{\"Decoder
 
name\":\"DecryptingVideoDecoder\"},\"stack\":[{\"file\":\"../../media/filters/decoder_selector.cc\",\"line\":172}],\"status_code\":265,\"status_message\":\"\"}"}
[20248:20383:0821/200904.173566:ERROR:object_proxy.cc(622)] Failed to call 
method: org.freedesktop.PowerManagement.Inhibit.Inhibit: object_path= 
/org/freedesktop/PowerManagement/Inhibit: 
org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this 
sender from sending this message to this recipient; type="method_call", 
sender=":1.504" (uid=1000 pid=20248 
comm="/snap/chromium/1260/usr/lib/chromium-browser/chrom" 
label="snap.chromium.chromium (enforce)") 
interface="org.freedesktop.PowerManagement.Inhibit" member="Inhibit" error 
name="(unset)" requested_reply="0" 
destination="org.freedesktop.PowerManagement" (uid=1000 pid=1571 
comm="xfce4-power-manager " label="unconfined")
[20248:20383:0821/200904.173588:ERROR:power_save_blocker_linux.cc(373)] No 
response to Inhibit() request!
[20248:20383:0821/200904.379145:ERROR:object_proxy.cc(622)] Failed to call 
method: org.freedesktop.PowerManagement.Inhibit.Inhibit: object_path= 
/org/freedesktop/PowerManagement/Inhibit: 
org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this 
sender from sending this message to this recipient; type="method_call", 
sender=":1.505" (uid=1000 pid=20248 
comm="/snap/chromium/1260/usr/lib/chromium-browser/chrom" 
label="snap.chromium.chromium (enforce)") 
interface="org.freedesktop.PowerManagement.Inhibit" member="Inhibit" error 
name="(unset)" requested_reply="0" 
destination="org.freedesktop.PowerManagement" (uid=1000 pid=1571 
comm="xfce4-power-manager " label="unconfined")
[20248:20383:0821/200904.379183:ERROR:power_save_blocker_linux.cc(373)] No 
response to Inhibit() request!
[20248:20248:0821/200913.822437:ERROR:event_router.cc(713)] Event dispatched 
while shutting down extensions browser client.

libva info: VA-API version 1.8.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_8
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.8 (libva 2.1.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 20.2.pre 
(f403839f)
vainfo: Supported profile and entrypoints
      VAProfileNone                   : VAEntrypointVideoProc
      VAProfileNone                   : VAEntrypointStats
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Simple            : VAEntrypointEncSlice
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointFEI
      VAProfileH264Main               : VAEntrypointEncSliceLP
      VAProfileH264High               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointEncSlice
      VAProfileH264High               : VAEntrypointFEI
      VAProfileH264High               : VAEntrypointEncSliceLP
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD
      VAProfileJPEGBaseline           : VAEntrypointVLD
      VAProfileJPEGBaseline           : VAEntrypointEncPicture
      VAProfileH264ConstrainedBaseline: VAEntrypointVLD
      VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline: VAEntrypointFEI
      VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP
      VAProfileVP8Version0_3          : VAEntrypointVLD
      VAProfileVP8Version0_3          : VAEntrypointEncSlice
      VAProfileHEVCMain               : VAEntrypointVLD
      VAProfileHEVCMain               : VAEntrypointEncSlice
      VAProfileHEVCMain               : VAEntrypointFEI
      VAProfileHEVCMain10             : VAEntrypointVLD
      VAProfileHEVCMain10             : VAEntrypointEncSlice
      VAProfileVP9Profile0            : VAEntrypointVLD
      VAProfileVP9Profile2            : VAEntrypointVLD

audio_buffering_state   {"state":"BUFFERING_HAVE_ENOUGH"}
dimensions      "1920x988"
duration        243.981
error   
"{\"causes\":[{\"causes\":[],\"data\":{},\"stack\":[{\"file\":\"../../media/filters/decrypting_video_decoder.cc\",\"line\":53}],\"status_code\":264,\"status_message\":\"\"}],\"data\":{\"Decoder
 
name\":\"DecryptingVideoDecoder\"},\"stack\":[{\"file\":\"../../media/filters/decoder_selector.cc\",\"line\":172}],\"status_code\":265,\"status_message\":\"\"}"
event   "kPlay"
info    "Selected video track: []"
kAudioDecoderName       "FFmpegAudioDecoder"
kAudioTracks    [{"bytes per channel":4,"bytes per frame":8,"channel 
layout":"STEREO","channels":2,"codec":"opus","codec delay":312,"discard decoder 
delay":true,"encryption scheme":"Unencrypted","has extra 
data":true,"profile":"unknown","sample format":"Float 32-bit","samples per 
second":48000,"seek preroll":"80000us"}]
kFrameTitle     ""
kFrameUrl       "https://www.youtube.com/watch?v=_l6sbhjm8pk";
kIsAudioDecryptingDemuxerStream false
kIsPlatformAudioDecoder false
kIsPlatformVideoDecoder false
kIsVideoDecryptingDemuxerStream false
kResolution     "1920x988"
kVideoDecoderName       "VpxVideoDecoder"
kVideoTracks    [{"alpha mode":"is_opaque","codec":"vp9","coded 
size":"1920x988","color space":"{primaries:BT709, transfer:BT709, matrix:BT709, 
range:LIMITED}","encryption scheme":"Unencrypted","has extra data":false,"hdr 
metadata":"unset","natural size":"1920x988","orientation":"0°","profile":"vp9 
profile0","visible rect":"0,0 1920x988"}]
origin_url      "https://www.youtube.com/";
pipeline_buffering_state        
{"for_suspended_start":false,"state":"BUFFERING_HAVE_ENOUGH"}
pipeline_state  "kPlaying"
player_id       43
render_id       27
url     "blob:https://www.youtube.com/a1cf0fdf-8d73-4a23-ba8d-f984c18dfaa6";
video_buffering_state   {"state":"BUFFERING_HAVE_ENOUGH"}

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https://bugs.launchpad.net/bugs/1816497

Title:
  [snap] vaapi chromium no video hardware decoding

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