Allow audio-only recording in Talk

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Feature request

Which Nextcloud Version are you currently using: (see administration page)

Nextcloud Hub 9 (30.0.9) / Nextcloud AIO 10.12.0

Is your feature request related to a problem? Please describe.

Video recording is draining the full CPU power on my instance (6 dedicated core VPS).

Describe the solution you'd like

Allow recording audio only in Talk. Perhaps :

• letting admins only allow audio recordings of Talk conferences (in Talk settings)
• letting moderators select video or audio when starting a recording in Talk

Audio-only recording would also enable call summaries in Talk on instances with lower CPU power.

Describe alternatives you've considered

Tweaking the resolution and ffmpeg settings of Nextcloud Talk Recording to reduce the load.

Additional context

I could not find an easy path to modify the resolution and ffmpeg settings in /conf/recording.conf on the AIO container (see #35).

Start by inspecting the recording implementation and the /conf/recording.conf and FFmpeg configuration path mentioned in the issue. Determine whether audio-only recording should be controlled by administrators, moderators, or both; done means Talk can record audio without the CPU cost of video and the chosen configuration is documented or testable.