3D vector animation of a person walking

I’m trying to figure out how to make a 3d vector animation of a person walking or dancing. more specifically, the outline of a person walking/dancing.

I’ve seen this before on other sites, but can’t remember where. sometimes it’s the 3d outline animation, sometimes its asingle-color 2d animation. does that make sense. I’ll try to post an example if I find one.

Anyway, does anyone know this process or know of a place that shows how it’s done? thanks.