Does the girl (who thinks they are a boy) realize why there are boys and girls locker rooms? It's not because of culture or gender values, it's literally because of the physical difference between boys and girls. The anatomy, the privacy, the risk...
Ok to get that obvious point out of the way. How is the girl who recorded the video not in trouble for recording... a video inside the boys locker room? I would presume that's against the rules, too.