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I have read in the past that there is a video somewhere in the internets that shows someone doing acrobatic maneuvers while wearing heavy armor. My google-fu is weak today. If someone could provide a link to this video, I would appreciate it.
I don't know about a video, but I've seen it demonstrated in real life at the Royal Armouries Museum in Leeds (UK). I was astonished at the feats of agility the two guys in full plate were able to accomplish.
I don't know if there's a tumbling demonstration on AEMMA's website (http://www.aemma.org), but there are a number of full-contact fighting demos that show how fast a man in plate can move.
You know, GURPS has gotten lots of flak for its claim that you can do acrobatics in plate mail. Plenty of people said that this "proved" that GURPS was unrealistic after all...