How does the hinge mechanism of plug-type pressure doors work? Many pressurized aircraft have the type of plug doors that open by first swinging inside,  rotating about at least two axes, then moving through the opening and ending up outside parallel with the fuselage.

I'm intrigued by the mechanism that makes this possible, but I have never been able to really see how these intricate hinges work. As a passenger it's hard to even witness the actual opening or closing of the door. Some drawings are to be found on the web, but none that I know of give a clear understanding of its workings. Does anybody know of a video or an animation that gives some insight?
This video has a clear shot of how a classic plug door (in this case of a B737) works (or search for flight attendant training videos).

You can see the door pops in (tipping a bit downwards) and then rotates on a axis in the center of the opening and then moves outside sideways. This is possible because of how the geometry works out, moving sideways negates the boor being wider than the opening and tipping down lets it fit height-wise.