This is probably something you wouldn't want to happen to you, nor is this. They neatly illustrate what is certain to be the next big problem in teaching.
Type in 'Teacher' on Youtube and you will be amazed (hopefully) to find that there are about 13 000 videos. Some show teachers being beaten up, some show teachers purportedly drunk, losing their temper or doing the sort of things that people do. Others just show teachers teaching and some are probably faked.
This has all the signs of a future nightmare. Cameras on phones are constantly improving and becoming ever cheaper. It's very easy to post stuff on Youtube but virtually impossible for the subject to know if they are on there.
Requesting that material be removed should be fairly straightforward (especially now that they have been bought by Google) but if you are unaware of its existence then you will only find out that you are a film star long after your entire school has; maybe when someone kindly mentions it at Parents Evening for instance.
Any school that doesn't at least try to ban mobiles is utterly mad and has only themselves to blame.