This affects me as well, kernel 5.4.0-96 atm.
When I plug in the camera and run dmesg | egrep 'usb|uvc|video|cam|Cam':

[23785.501888] usb 1-4: new high-speed USB device number 12 using xhci_hcd
[23785.745623] usb 1-4: New USB device found, idVendor=041e, idProduct=4095, 
bcdDevice=20.20
[23785.745625] usb 1-4: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[23785.745627] usb 1-4: Product: Live! Cam Sync HD VF0770
[23785.745628] usb 1-4: Manufacturer: Creative Technology Ltd.
[23785.745629] usb 1-4: SerialNumber: 2015012638825
[23785.754877] usb 1-4: 3:0: cannot get min/max values for control 2 (id 3)
[23786.361794] usb 1-4: 3:0: cannot get min/max values for control 2 (id 3)
[23786.362795] usb 1-4: 3:0: cannot get min/max values for control 2 (id 3)
[23786.364790] usb 1-4: 3:0: cannot get min/max values for control 2 (id 3)
[23786.365776] usb 1-4: 3:0: cannot get min/max values for control 2 (id 3)

The camera mic works fine but the camera is not detected as a video
device. The integrated latpop camera works fine.

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https://bugs.launchpad.net/bugs/1956461

Title:
  Creative HD720p webcam doesn't work

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After installing kernel 5.4.0-92 the webcam Creative HD720p stop to be seen 
by the system. There is no  /dev/vl4/ folder
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  piotr      3094 F.... pulseaudio
   /dev/snd/controlC0:  piotr      3094 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux Mint 20.2
  InstallationDate: Installed on 2020-06-07 (578 days ago)
  InstallationMedia: Linux Mint 19.3 "Tricia" - Release amd64 20191213
  IwConfig:
   enp3s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. H67MA-USB3-B3
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-92-generic 
root=UUID=3bdaa7b0-765c-41ce-b67a-deeeabde9c42 ro quiet splash
  ProcVersionSignature: Ubuntu 5.4.0-92.103-generic 5.4.157
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-92-generic N/A
   linux-backports-modules-5.4.0-92-generic  N/A
   linux-firmware                            1.187.24
  RfKill:
   
  Tags:  uma
  Uname: Linux 5.4.0-92-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 10/27/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F4
  dmi.board.name: H67MA-USB3-B3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd10/27/2011:svnGigabyteTechnologyCo.,Ltd.:pnH67MA-USB3-B3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnH67MA-USB3-B3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: H67MA-USB3-B3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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