I'm not able to get the demo to work properly. I'm using the ASV plugin (with Firefox and Opera). The canvas is rendered, but the video doesn't appear.
Yes, Adobe SVG Viewer 6 Preview Release is required as it is the only player to provide an early implementation of the new SVG 1.2 video features. If you are concerned about installing ASV6 over ASV3, you can use the great SVG Switcher to maintain both on your systems and even keep ASV3 as the default.