Public Freakout

Legally, it's location dependant as to whether the shop owner can move someone away like that. Same with whether or not filming would be okay there. Same with whether or not anyone was obligated to retreat before using force.

That being said, the camera guy was the bigger douche, no matter what the legality was. Blocking a doorway, escalating the situation at each step, and then stepping right to pepper spray without moving away from someone else's property. Had the shop owner followed him away, spray would be legit. Camera guy was the initiating party by doing something douchey. Everything else in the video clip stems from him being an asshole in the first place.

That italic section is there because there's most likely a back story to this clip, and may or may not be relevant to an appraisal of the actions in the clip itself. We can only go off of what's there when forming an opinion on the events depicted. Too many what ifs make it dumb to even try.