Its a simple idea, not everyone wants to have pictures taken of or filmed and its impossible to gain consent in a maxed out instance.
In real life many clubs, especially in Europe as a requirement of entry force you to put a sticker over your phone camera for this very reason.
One issue i do see is when you want someone authorized to film to infact film. so some sort of whitelist would need to be in place too.
Another is obviously it would have to not be bypassable with OBS or video capturing tools. I think I've seen ways to black out streamed footage that can be programmed in to software? i'd love this thread to discuss on that too!
There could be options to this too, camera out, and photos and prints allowed but no obs output if possible, or just no camera at all.