Stuttering in Skyrim due to low Video RAM.
Stutter when I first look to the left at 0:06 (subsequent camera movements are smooth)
Big stutter when I first pan to the right at 0:51, right after I let the mouse sit for about half a second (subsequent camera movements are smooth)
For the most part everything else in between is fine and any other choppiness in the video is just the stress of the game combined with shadowplay.