I've seen some issues trying on the implementation of video, they want to put it on canvas as DOM-less and can be drawn, the problem is that Scirra concerned about the formats like H.264, OGG, WebM and among other modern browser do not work, but I've seen the fallback methods are working perfectly. There is another problem, Scirra worries if they can implement the video encoder plugin very similiar to Audio plugin, We have Audio and User Media, why not video? we know there a third party plugin is Rexrainbow's video, but it is a DOM element how is not drawn on canvas.
Benefits of DOM-less video:
This is a matter of doubt.