Add support for AV1 video encoding (hardware-accelerated)

[major-mayer]

Is your feature request related to a problem? Please describe.
This is a follow up on my previous bug report, that dealt with the general hardware support of Intel Arc A380 graphics cards in go-vod: #1224
Since this is working fairly well now, i would like to make use of the AV1 video encoding capabilities that this graphics card features.
This allows for lower bandwidth with the same video quality.

Describe the solution you'd like
If hardware acceleration exists, it should be possible to enable AV1 for video encoding in the settings.
I doubt that regular CPUs will be fast enough for real-time software video encoding...

Describe alternatives you've considered
None, as there are no other advanced and universally supported video codecs as of now.

Additional context