Sorry about the delayed response; for some reason the forum never showed me that there was a new post on this board.
Have you made sure that you are updated to the latest version of the
Vertex Upgrade Patch?
Being able to set a video background in the theme options is a theme-specific thing, and isn't available in all themes. If you are on a recent enough version of the framework, you may be able to follow this tutorial to add a video background, but that really depends on the structure of the theme:
http://www.shape5.com/demo/wp/outdoor-life/tutorials/custom-code-used-for-this-design/