>>2386131>>2383870Think I've got it. It is a model, just maybe with a unnecessarily high res jpeg of a real ball for a texture. You can briefly see the ball deform just after it's kicked. The bottom left of the ball pinches inwards, then just as she falls, behind her head, the ball distorts with a hard point.
It can't be truly optical with keying and masking, as the girl falls in front of the ball, so the irl girl would be visible, or at least her legs would be.
As for the distortion, I'm not very familiar with mo-cap but I could see playing sensors around or inside the ball, that relay position to each other as the ball is squish, which then is applied to the 3d model, which again looks really good thanks to the unnecessarily high res jpeg texture.
Is this making sense? It's really the only logical conclusion I could come with.