You are about to see a frame by frame rendering taken and enhanced with VLC that clearly shows JFK's driver, named "GREER" taking a pistol, extending, shooting and retracting.
The full video was never shown to the official inquiry at the time. This video was not altered like the others, and the gunmen is visible (all the other videos zoom in).
The man credited with this idea is William Cooper. However I have the video, and I have shown it to be indisputable.
JFK was shot by the driver, inside his own vehicle, the video shows it, frame, by frame