Raj ACLook, you don't need people to turn their cameras on.
I've been speaking in public for 24 years - you cannot tell what an audience is thinking by looking at them.
Newsreaders, YouTubers, politicians - lots of people - speak to cameras without seeing their audience. It's a crutch you can learn to live without. (Not to mention #neurodiversity means cameras aren't necessarily helpful.)
You *do* need them on for group work but this is not the same thing.