This is the video of the November altercation between J.R. Smith and a couple of trash talking teens. The majority of the video is of the teens talking shit.
The teens claim that Smith choked one of them and you really can't see that in this video. He does walk back towards them briefly and it appears to have become physical but you really can't tell what happened.
Smith must not have choked him. If he did it would probably be on the teen's video, but we don't get to see that part from his camera.