I checked to see if I could play the video - and I can.
Click on your name in the upper-right corner. Then, select Set Preferences. Finally, change the Video Player Preference to "brightcove video player." This usually helps - and you can always set it back later.
and, for what it's worth, there are times when the video simply won't load due to network congestion between you and it. This is usually very temporary, albeit frustrating.
Manash, actually we made a further change to improve consistency of the "default" player just this morning. Do you mind switching it back and seeing if it works now? (after logging out/in if you are already logged in) If there any issues, feel free to switch back to brightcove.