I appeared in in front of a camera a couple of times - about 9-10 or so years ago when I was fitter and younger. Both in gangbangs.
One with a couple of Polish girls who were getting a portfolio done with a guy/photographer. Can't remember the name of the guy who used to film those gangbangs. He always used to wear a bandana, some of you might know him - I think he made lots of videos then. We still had to pay for the gangbang though but not as much as usual because of the filming.
The other and better experience was when I participated in an 80-man no-holes barred gangbang with Sabrina Deep for her live webcam show. As I was wearing a mask I didn't mind the cameras at all. Although plenty of face masks were available a few guys were happy to go without. Anyway when you're in the heat of the moment and you are ready to go, everything just flows. The best thing about it, well apart from fucking Sabrina in all her holes, is that it was free; we didn't have pay for it. She was making tons of money from the webcam show.
Each guy had about two hour slot to perform. I managed to fuck her three times and then I had to leave. My only disappointment was that we weren't allowed to fuck the fluffer girl, who was way, way hotter than Sabrina, her only job was to get the guys ready.
If I had the chance I'd do it again, although I wouldn't be able to preform as I did then; age is creeping up on me. But, yes... highly recommended, it's great fun pretending to be a porn actor.
All done with condoms btw.