Well, sprinting is in, so presumably the panting and head bobbing are part of that feature. The whole scene with the dragons is definatly in game, but scripted. And that's OK, nobody should be complaining about it. it's normal for game developers to put short scripted scenes in their trailers. The rest was all gameplay.
Just elaborating on this, the "Bobbing" and "Camera Shakes" are part of an effort to remove the feeling that Morrowind, Oblivion, Fallout 3 and New Vegas share, the unshakable feeling of piloting a small, hoving camera with arms perpetually in front of it. They're really trying to make it feel as though you're looking through "Eyes", and so far, I think they've done a pretty admirable job, even if some of the early reports on the camera during melee are less-than-perfect.