Just so anyone looking for scripts will find it here:
I just whipped up this plugin (attached) - hopefully there are no issues, but might require some updates if you find any.
Copy the IntroVid.nut into your plugins/ folder.
Launch AM, hit TAB (Settings), Plugins, IntroVid
Set Enable to Yes
Set Filename to the filename of the video (if you don't put a path, it will be looking in your current layout folder
Set Audio to No if you don't want it to play the Intro audio
The next time you start AM, it should play the intro. If you press any key, it will skip it.
It is also on my GitHub, where I will do any updates:
https://github.com/liquid8d/attract-extra/blob/master/plugins/IntroVid.nut