Support Video Acceleration API (VA-API)

va-driver-all pulls in all libraries/drivers needed for Video Acceleration API (VA-API), that provide accelerated video playback and video post-processing for a great number of supported graphics cards. gstreamer1.0-vaapi links them with GStreamer and thus Totem. Installing these packages would improve video playback performance on very common hardware, hence improving UX UX and possibly lowering the amount of (recurring) requests for another video player than Totem. Installing them on Tails 3.1 downloads 2 MiB of packages.

Next step is to verify that VA-API is used (in practice) in Totem with this change applied.

Related issues

Related to #15433 (closed)
Related to #7929
Blocked by #15132 (closed)

Original created by @intrigeri on 14580 (Redmine)

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