Nope. Needs to use chains.

It's actually a sport in Estonia: https://en.wikipedia.org/wiki/Kiiking. The swing must have rigid arms.

To do it on a standard swing with chains, you need something to give you a serious push, like a Jetpack: https://www.youtube.com/watch?v=c0zAzqSa-5o

Do it with chain or rope and then you can say "myth busted".

fixed supports is easy. Try it with chains.

It's possible with rigid arms, and it's easiest when they're short. But people do compete over how long the arm can be. https://en.wikipedia.org/wiki/Kiiking

We walked by yesterday... He's still going.

of course it's possible with a rigid arm, it's a super common circus act.