The only reason an SP would really have to secretly film a punter would be to blackmail them after. Considering how rare reports of blackmail are on here, I can only conclude it's not really a worry.
Any identifying footage of a punter in the act would effectively out the SP too, and while paying for sex is legal, selling sex may be enough to get a tenancy revoked, and operating a brothel would get the SP into legal trouble.
A punter worrying about their activities being made public would be better off focusing on their discretion to and from the punt, that's when you're most likely to be spotted and require a cover story.