An AI character swap video replaces an on-screen person or character using reference photos. Unlike a face swap, it can guide the character's hair, clothing and body appearance as well as facial features. The video supplies the performance and camera reference; the photos define the new cast. This is generative video editing, not timeline editing.
The result is a newly generated video, not a pixel-perfect modification of the original. Check the whole performance, especially turns, hands, overlapping people and background details.