I don't see any videos here ?
You are probably using Internet Explorer 6,7 or 8 which has no support for html5 video. IE9 [Windows 7 only] purportedly does.
If you want to continue using IE 6,7 or 8, you can quickly install the google chrome frame plugin - your milieage may vary. The best solution, download a superior, free browser like Firefox, Google Chrome or Opera for a better experience not just here, but across the web
A third solution is the download the videos and watch them outside of the browser with a free media player. Click the camera icons above to download the videos. [MP4 format] Again, Windows has a media player but there are far superior free options. These include KMPlayer, Media Player Classic and VLC