I am an RC hobbyist and fly quad copters similar to the one used in the video. Mine has an all up weight with camera of about 1KG and could produce similar footage (or better with an ND filter).
I never fly it near airports or other full scale flying machines and never will however I WOULD fly it in the manner in the video. Failure resulting in loss of control is VERY rare and I have not yet heard of someone being injured by an out of control quad.
We risk ourselves everyday, from driving in cars at speed with one hand on the cell phone to flying clapped out 40 year old GA piston singles over the suburbs and yet there is an uproar when a small plastic quad arrives on the scene!!!!