No answer for reason of not knowing where your server is and where you are.

In general persons retain the right of publicity copyright of their person.

Notwithstanding, if they run down the road naked (or appear in other public place) in an "impromptu performance" that is without planned intent for compensation -- their images of their "impromptu performance (or appearance)" are public domain.

So where is the content from and where are you from? That would determine the answers to your other questions -- jurisdiction and law.

For discussion purposes only and not offered as legal advice