Yep there's 0 incentive to allow this by the actual decision makers (companies) to open themselves up to sending potentially law-suite leading footage to a 3rd party.

Completely valid point, but what if we invest so much in anonymizing the recordings, so that it is not possible to identify the companies or jobseekers involved?

Good luck with that. Programmers are good at de-anonymizing data, and video of people having a conversation is ripe for being de-anonymized.

But the videos are completely anonymized... So no one who know who recorded who, or what do you think?

Remove the audio and video of the people involved, keep the rest. Not very useful.

What about a real-time voice-to-text transcription of the interview?

This is a bad idea for so many reasons. For starters, you’re not going to be able to use any video where the interviewer is in a two-party consent state, and good luck determining where an interviewer is currently located with 100% confidence.