Adding to stillgar's correct answer, the movie is in JEVOIS:/modules/JeVois/JeVoisIntro/movie.mpg
you can replace it by something else that is 640x360, any formt that OpenCV VideoReader supports. But note that the guidance text at the bottom and the flashing disks will remain. Deleting the movie is not supported.
If you do not want the intro, you can use the already setup 640x312 video mapping, which launches the DemoSalGistFaceObj module, which is basically like the intro but with no movie and no guidance text at the bottom, i.e., it just runs the machine vision algorithms.
The purpose of the video is to provide an out-of-the-box experience that reminds you of the KS campaign. That module is intended to just run once when you first plug your camera in. Then you probably want to use DemoSalGistFaceObj or other modules.