Isn't it? In practice it means that the "video" should live outside of the git repo, you could just download it from an external repo, and you always have the script to recreate it if it ever goes down.

For example:

PromotionalDemo.mp4.script

"Make a video 10 seconds long showcasing the video, a voice in off should say 'We can click here if we want to do this, or click there if we want to go there'. 1024*768 resolution. Male voice. Perky attitude"