My neighbor made this swing for us many years before this video was filmed, we used to put two ladders up to the trees and have people helping the person on the swing to go round, and we would strap ourselves to the seat with straps.
We thought it would be impossible to go round all by ourselves, and my uncle had promised 500 kr. (around 50 dollars) to the first one doing it.
This was the first time anyone managed to do it alone, and a few days after this my brother also managed to do it.