I was on the tiered seating next to pool watching my DC swim at the far side of the deep end. At the near side was a life-saving class for teenagers (about 15 of them, a mix of boys and girls).
Another teen came and sat on the tiered seats and seemed to know a couple of the teenage boys a bit. He was also on a video call with someone and had his own camera facing out to the pool. I occasionally glanced over trying to see what he was doing and I could see out of the corner of my eye that he kept checking to see if I was looking at him. He was definitely getting at least one teen boy in his camera view and giggling with whoever he was talking to, especially when they were bouncing up and down practising cpr on a dummy. I couldn't tell who else he was possibly filming but he was pointing the phone in various direction, and of course everyone was in swimming costumes, and there were small kids in lessons there too. He's actually there every week with his phone out but I've never sat close enough to see what he was up to before.
The two boys who appeared to know him were getting irritated and gesturing him to go and he was laughing and saying "but why? Just tell me whyyy and I'll go". They were definitely not joking with him and seemed upset rather than friends. To be honest it had the feel of a bullying type incident as the two boys were overweight and he was really laughing at them when they were bouncing around more, as in the cpr. It felt very off.
In the end I walked down to the poolside (a long walk where you have to go out of the pool area, down some steps and back through the changing rooms) and found the pool supervisor. I explained what happened and pointed the guy out. He thanked me and went off and talked to the life-saving instructor. I caught him again a few minutes later and asked him what would happen- would there be an incident report or anything. He said that as he hadn't been able to see what was happening for himself there was nothing they could do and that this person was friends with a couple of the boys. He said he'd keep an eye out at the lessons as he does appear each week.
AIBU to think this is really not enough to not even approach and speak to the guy?! He can never expect to 'catch' him when he's sat a metre and a half above them and can't see his screen. Plus it's such a long walk to get to the seating, even though it's right against the pool side in the same room and not behind glass. He can't just pop behind him to see what he's up to. I got the impression that I was overreacting to think it was unacceptable to be filming (or broadcasting in a video call) teens and children in a private swimming lesson when you aren't even a parent (plus parents have one lesson they are allowed to take a swimming photo in and it's apparently banned at other times).
For the remainder of the lessons I've a good mind to go and sit right next to him if he turns up again 
Am I going crazy to think this needed addressing in some way by pool staff?!