Much as I hate to say it; in this specific case and set of circumstances, and with the information I can see so far, I agree with SVT.
I possibly would too in this case if were not for this:
history of initiating confrontations with police officers and recording the incidents.
This makes me very suspicious. Its possible the guy pulled a MEM and started purposely acting suspicious. It is also possible he didn't do anything other than open carry and be polite the whole time. I'd like to see if this guy has a youtube channel and a history before I start agreeing with anyone.