As far as alI know, most internal zoom meetings are done video off, while those with clients are usually video on.
I dunno why you are hating on people who don't want to be on video for work. I didn't sign up to be on video, have it recorded onto onedrive and a transcript emailed out at the end of the meeting. I'd take my massive c*ck o to OnlyFans if I wanted to be on camera for money. As for the majority of those assholes in the office if they wanted a recordable performance, they should of recruited from Hollywood.
Look, if they were overperformers, I wouldn't care but they aren't. I suspect they might have a second job though. Meaning possible Zoom meeting with another company at the exact same time. If they're on camera, that wouldn't be possible. And why do I care? Well, the product I'm working on is rather complex and takes a lot of effort and long time to get proficient in it. Much easier to slack as long as possible then if shit hits the fan just disappear, especially if they already have a backup place. And who's left to pick up the pieces? The suckers who tolerated such behavior, me included. So the time they fill a slot without contributing and then fucking off it's wasted opportunity to bring someone professional and interested. Who at least can handle having a second job transparently. Then I wouldn't care. Till then, cameras on!
This is what trail/probation periods are for, you make sure the worker is working as hard as you expect and if not you fire them. Lots of companies and managers just let workers slack as long as they just show up for work and are pretending to look busy, which sounds like you.. Don't make them turn on the camera, make sure they are committing good quality work at the expected quantity relative to what you are paying them, otherwise fire them.
Weird argument... Seriously, switching on or not your video on zoom calls elicits that level of anxiety?! Maybe this is all too much for you to handle... How about, meetings are a general waste of time, Zoom meetings are at least as wasteful and people working from home, mostly in t-shirts and underwear know it's inappropriate and unprofessional to be seen that way on recorded video. Moving on...