Optimise tokbox page and add PDF viewing functionality

My website is using Tokbox for live video, and I want to optimise the video to fill half the screen while leaving the other half for the chat box, whiteboard or PDF. Ideally the whiteboard could change the background to be a pdf, so the student could write on top. Optimised for any device size (meaning takes up the entire screen on any device); if on smaller device, the bar at the top of the page should disappear.