This video shows a young lady showing off what she considers a skill or talent. Which is the ability to bend her right leg until it’s facing in the wrong direction.
We’re clearly not being told the whole story here. It may well be her real leg and not artificial, as she states at the start of the video, but she clearly has some kind of strange condition.
We know because you can see her crutches casually leaned up against the wall in some of the clips or her showing her “skill” off to other people.
It must be cool having a party trick to impress people with, but I’m perfectly happy with my normally functioning legs, thank you.