Ive been looking into getting the DJI Phantom. There first one will mount and fly a GoPro no problem, its what it is meant for. Also they just released a version 2 that has a built in camera and FPV capabilities(awesome!). They make so many aftermarket features for it and seems to have the best out of the box flying. they range from $500-1200.
He has a headset on that transmits the signal to his headset that he is seeing exactly what we see in the video. Theres no way he coyld have flown it that far without losing site of it. You can see him wearing it in the video. I fly rc planes and helicopters. Ive seen this before they are cool.