to have any sort of quality video, such as to be able to see hits (and potential fouls) cleanly, you'd likely need something fixed, not worn. Perhaps the fancy Mission Impossible stuff is indeed out there, but i doubt anyone is going to that extent to try and pirate a four hour pool video. Since we've already seen how little marketing interest there is in it.Actually, it would be extremely easy since, they won't be allowed to do a full body search when you go in. The technology has been affordable for quite a few years.
And remember, these showings are a private affair, they could do whatever searches they wanted, if they felt it was warranted.