A maze of hypotheticals....

If somebody acts like a twit in a public place, they don't have an expectation of privacy - they're in public.

If somebody turns a video recording of an alleged crime over to the police, and the police concur that there's reasonable cause to believe a crime occurred, the police will forward the report and video to a prosecutor's office for review. If it's a video taken in a public place, odds are its admissible.