Hmm... I think to do that you'll need to use a text or button link on a hidden page of your site and upload your video using the file option. Once you've done that, you'd then visit the hidden page and right-click the link to get the URL of the video file. Once you have that you could use it with whatever code you are writing to embed the video. I'm not sure whether or not we will let a file linked from somewhere else load, though.
