SAM 3 Video Mask

Cuts one subject out of a video as a mask: the subject white, everything else black, same frame count and frame rate as the clip. SAM 3 finds what the prompt names and tracks it through every frame. For motion-capture nodes that take a person mask video alongside the clip. Uses ComfyUI's core SAM 3 nodes, the same tracking step as its SAM 3D Body template. SAM License: https://github.com/facebookresearch/sam3/blob/main/LICENSE