Question about certain type of animation

What are those animations called where someone has a video that is not animated, like just from their camera or whatever, and they make swirly animations from it? They put lines on the screen to synchronize with a dance or whatever happens in the video. This is probably a bad description, but i dont know how else to say it nba reddit

Ok i thought of a way, they draw lines that move around on the screen or go around the outline of a person. I just want to know what they are called so I can try to make one. reverse phone lookup