Edit: I wonder if it's this. Pretty neat!
Edit again: 'course that was one guy's home-brew mod... not any kind of off-the-shelf solution. So I dunno actually if that's what the guy in the video has or not.
Consider a few things:
First off, the vintage of the picture. It's pretty old. Check out the apple webcam up top there.
Second, notice that the box isn't actually plugged into anything. It's just sitting there on its own.
Third, the back of the little box is an EXACT scaled down back panel of a PowerMac G5, which would fit the timeframe of the image as well.
My conclusion would be that the thing on the desk is a quarter scale engineering model of a powermac G5. A design paperweight of some sort.