Draw to canvas

There are times when the client asks for features or experiences that does not involve augmented reality. For example, an AR experience, switches to a game, or a video, or something. When not in the AR experience, it would be nice if we had control over the DOM to draw to the canvas and do things that are either impossible in zappar or much more difficult and clunky. Then we could use libraries like http://paperjs.org/ , etc.