if you asked, how do i add music or sparkles to my arrow, i would say to avoid those too. a youtube video is also an exit point, and you don't want that. but mostly you don't want any kind of distraction. the main point of videos is to get people into your site, once there, seal the exits. and if the video is blinky like that, just be aware that there are people who will be sensitive, and with a black background the effect will be more profound. it wasn't meant to be a critique, but my immediate judgement after watching 5 seconds of that video.
---Mike Savad
MikeSavad.com