I'm sorry, but this has a lot of the markings of an odd story. I am sorry if this really happened. I just don't know that creating an account on some travel site is some great first step. It appears that TripAdvisor wasn't helpful. I wouldn't post anymore of these.
The video recording stuff isn't as cut and dry as many of you make it out to be. Good luck trying to get even the police access to another person's phone. Because if the shoe was on the other foot, you wouldn't want anyone to access your phones without some warrant. Especially on the reasoning that they were filmed. The other person could very easily come back and say something like "it was my room and here is xyz reason I was concerned". Put the shoe on the other person's foot again. If they walked into their room, found some strange activity, and no one believed them, every one of you would be yelling "you should have recorded it!"