yes, even on the streets as Jussie Smolett discovered, we're always on camera.
I think @davebk is more concerned about hidden cameras in a room for the enjoyment of the client later or for the escort to blackmail guys that hired him.
I used to have an acount on xtube and I recognized a few escorts having sex with someone with his face blurry in a hotel room. The guy was bragging about all the hot guys he gets on his trips. He forgot to mention he paid them and filmed them without their consent. Some fraternities required for initiation seeing a vide of the guy banging a "hot chick". A friend of mine is a Dean and asks his daughter NOT to ever have sex in someone else's room, bf, hookup, etc... He said to her "you only know you're not being filmed when you're in your room".