It's quite possible that I have been filmed, as I once visited a WG who had a laptop with some sort of webcam program running, I could see myself onscreen. She said it wasn't sending, her flatmate had been using it.
Didn't bother me. I gave a little wave at whoever might be watching, then enjoyed a good shag. Nobody would be interested in seeing it, except maybe someone who knows me, and she had no way of finding out my identity. Some things really aren't worth worrying about.