LOL!!!! It's not from official sites or anything, it's a private guy who is filming on his little hand held camcorder :-) He's not allowed to move from his seat to get better shots.
There seems to be a lot of shying and acting up at these games from what I have seen (we got two 5-min transmission of dressage tests yesterday...wheeee), I wonder what it is, you think horses at that level wouldn't really give a toss about cameras etc.