Cop clearly over-reacted and was trying to intimidate the guy, who was merely being an asshole. I'l bet the cop violated departmental policy on drawing his weapon.
He said to get your hands out of your pockets, so probably not a violation.
There was zero cause for the cop to draw his weapon. Drawing your weapon merely to intimidate a citizen not committing any illegal act is almost certainly a violation of policy, as well as the law.
You don't know what he knew, for all you know the camera guy could have matched a description of someone to look out for. I don't have all the details and only one side gets told in cases like this.
I am familiar with this sort of thing, had it happen to me. I was walking my dogs in New Jersey and took a photo of the old historic jail downtown when some retard in a uniform and badge came out and told me I wasn't allowed to because of 9/11 and stuff. Patted his side arm to emphasize the point.
Now, I could have made a big stink, filmed him and shouted about my rights and maybe spurred on some social changes in that township but I have better things to do with my time.