I mean, I assume there's some nonzero cost to storing the video. But it sounds like they'll be doing that anyway.
If it's about the speakers showing up on video (maybe they didn't get and think they need releases), maybe get a transcript? Yes, that would be more expensive but they did just crow about their huge budget...
And yes, I know FOIA exists. This just reminds me about how they used to livestream Design Day but ONLY to the regional offices.