To the right, you should see a "nifty" little preloader with a bit of apologetic text about the fact that the video is loading and letting you know how long until it plays, etc. Eventually, the video will play there, honestly.
The video above is sized to accomodate less powerful systems. If you think your machine can handle it, click here to open it to size to take up your whole browser. For best results, make sure you resize to match the dimensions of the video.