It's actually easy to see what happened if you play the video full screen.
There's a honking right crosswind as the aircraft taxis up to the runway. The wind gets under the right wingtip and lifts the aircraft up so that now the left wingtip is scraping along the ground. The left wingtip dragging on the ground starts the aircraft around to the left, the wind gets under the tail and probably no amount of down elevator would save it at this point because the tail is substantially lifted up into the air with the aircraft over on its left wingtip. As the aircraft with its empennage high in the air comes more fully around to the left the ensuing tailwind finishes the job, and that's all she wrote!
It's a bit hard to tell from the video, but if I had to make a judgement it would appear that the controls are all neutralized, ailerons and elevator in a neutral position. This is wrong, of course. I don't know what they teach nowadays, but this dinosaur was taught
"When taxiing, climb into the wind and dive away from the wind".
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