feat: add API join parameters to customize virtual background

[liske]

Is your feature request related to a problem? Please describe. It would be nice if users would be able to configure a custom virtual background and to configure their preferred virtual background setting in a LMS.

Describe the solution you'd like Adding two additional parameters for the API join request would allow a LMS to pass the user's preference for the virtual background:

• virtualBackgroundsUserImageUrl specifies a URL where the user specific image can be fetched
• virtualBackgroundsUserThumbUrl specifies a URL where the user specific image thumbnail can be fetched
• virtualBackgroundsUserDefault specifies the prefered virtual background setting based on filenames from public.virtualBackgrounds.fileNames with some reserved options:
  • NONE do not enable virtual background by default
  • BLUR the build in blurring
  • URL the user specific background

The camera sharing view needs to present another thumbnail if virtualBackgrounds*Url have been passed.

Describe alternatives you've considered Adding the backgrounds to the server settings does not scale for this use case.

Additional context This should not conflict with #14075: if virtual backgrounds are disabled there is no need to handle the user settings at all.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.