>At least were I am coming from, you can also not just film random adults on the street.
If you live in the United States, the first amendment absolutely allows you to film anyone in public. It's a constitutional right.
This also applies to publicly funded facilities, like courthouses, libraries, post offices, the DMV, and also public schools - any publicly accessible area, in any facility that is publicly funded.
I'm not making this up, it's actually part of the constitution.