It took me a while to work this out, but there’s no video on that page you linked to. There is however a video here: https://www.paypal.com/webapps/mpp/home
I assume that’s what you wanted to show us.
It displays an image of the first frame of the video whilst the video is hidden so it can load in the background, and then once it’s finished loading a JavaScript event is fired (presumably by the HTML5 Video API – you’ll have to Google it) that replaces the image with the video.
The effect is seamless because the image is the first frame of the video. Slick.