Based soley on the tape and assuming no prior interaction between the cawps and this citizen, I would conclude the cop over-reacted.
Is that what the OP wants to hear?
There. You got it.
However, there was clearly interaction prior to the camera coming out, as there often is, that raised the cawps level of suspicion of the citizens motives, it appears.
This whole thing looks like an adult version of a 5 year old pointing his finger within inches of another childs face and saying "I'm not touching you".
ENough for an arrest?
Not according to this tape from the point it rolls.
It will be up to the on scene cops to articulate whatever they observed prior to the camera coming out. If they cant, then shame on them.
NYC cops have been dealing with this stuff since the Thompkins Square Park riots in the 80's. Every obnoxious anarchist doosh with a camera running around praying for a bad interaction with the poleez.
Unfortunately cawps are human, often stressed and sometimes make bad decisions. Is this a huge surprise to anyone?
Hardly would call it a poleez state.