Nope, it is definatly a camera attached to another person mimicing his movements. I rewatched it multiple times, frame by frame and there is way too much paralax in the moves and twisting for it to be a matchmove in the computer. It does not precisely match the actor. There is much independent movement in there, especially some twisting from the person who has the camera attached rotating their hips.
It definatly has some speed changes in those scenes, but that is about it. Possibly some additional 2d jitter, but I doubt it. Otherwise it was just a well choreographed move on the part of the person with the camera.