Thanks for the update in utopic.
I now can play videos with vp9 codec and avplay, but I still can't encode 
videos with vp9 codec inside a webm container (like in the sample) :

The following command-line :
avconv -i original-video.MOV -c:v libvpx-vp9 converted-video.webm
fails with the following error message :
Only VP8 video and Vorbis audio are supported for WebM.

It's "normal" because version 10.3 of libav does not seem to include the
patch that allows vp9 (and opus) in WebM containers :
http://git.libav.org/?p=libav.git;a=commitdiff;h=d2ef708c95ace2518deffe830a9c439aeb9edd5d

I suppose I should open another bug on Launchpad to track that issue? Or
should I re-open this one?

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Touch seeded packages, which is subscribed to libav in Ubuntu.
https://bugs.launchpad.net/bugs/1296378

Title:
  Activate VP9 codec in libav

Status in “libav” package in Ubuntu:
  Fix Released

Bug description:
  "avconv -encoders | grep vp" gives only :
  V... libvpx               libvpx VP8 (codec vp8)

  It does not give the encoder libvpx-vp9, which seems to be necessary to 
encode with VP9.
  Or maybe I missed something?

  Based on 
http://git.libav.org/?p=libav.git;a=commit;h=9aa053ceded5550b2e538578af383fd89d82364c
 , VP9 is available in libvpx since version 1.3.0 , which is the version libav 
is built with : http://packages.ubuntu.com/trusty/libvpx1
  VP9 is also mentioned in the changelog of the libvpx1 package : 
http://changelogs.ubuntu.com/changelogs/pool/main/libv/libvpx/libvpx_1.3.0-2/changelog

  
  Same issue when trying to read a file with VP9 codec. I tried with 
http://base-n.de/webm/out9.webm
  "avplay out9.webm" gives :
  [matroska,webm @ 0x7f1a80005be0] Unknown/unsupported AVCodecID V_VP9

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