If you are on public property, or private property with the owner’s permission, you have the absolute right to video and/or photograph anything and everything in view. NOBODY has the right to make you leave. Nobody has the right to know why you’re there. You owe an explanation to exactly nobody. Law enforcement officers who know which way is up know this stuff stone cold and will take your side if push comes to shove.
This might help you:
https://www.youtube.com/watch?v=zSXj3lQSCH0
Good news. I hope the good guys are active watchers. Sadly, anything they might come up with probably can’t be used in court.