Rated 4 out of 5 stars
I like how this works. It's quite a nice experience. I can continue with the page I'm on, while having the video play in the top right.
There are a couple tiny little things that would make it better (and get that fifth star):
An option to include a close (X) button. Maybe on the top left.
An option to disable the animation when starting minimized. It's a bit distracting.
Also, a suggestion: add an option to get a lighter/brighter version of the backlight color instead of a random one. Oh, and maybe an option to choose how far out it goes.