Amazing footage!
Reminiscent of the Sydney City to Surf run back in the mid-80s. A 206 chartered by a TV channel was hovering over a sports field, just off South Head Road, to film the thousands of runners approaching. Then the camera shook a bit, then spun round and round and descended to crash onto its right side on the oval.
Cameraman kept tabbed on all the time and it made great viewing. All got out OK.
Another camera caught it from the ground as the brown-and-orange machine (known as The Jaffa, after the confectionery) spun out of sight.
The pilot went on to crash another time into the ocean, with less successful results. He had already crashed a chopper during training, when another pilot let him try to hover after a refuel, and he dynamically rolled it up after tripping over a 2" concrete slab. But that's another story...