I have never even tried to sneak a camera onto a ride. I learnt my lesson when I was young and attempted to jump a line. I "quite rightly" was removed from the line and was lucky not to be removed from the park. I wouldn't recommend breaking any rules as you could easily get thrown out of the park and it would achieve nothing.
I was on a giant-swing flat ride and there was a kid filming on his phone. They stopped the ride and removed him from the ride and luckily, they started the ride again so I didn't miss out on the ride. But anyway, that shows you that a lot of the time, you will get caught and removed form the ride/park.