What a recast means in AI video
Recasting started as a film term: replacing one actor with another after the fact. In AI video it means the same thing, extended to everything visible in the frame. The motion, the timing and the camera come from your footage; the appearance comes from your references.
The practical effect is that a take you cannot reshoot stays usable. You keep the performance and change who is delivering it, where it happens, or what product is in their hand.