The URL won't help you here. You need a program that can capture HTTP packets from flash player
FAQ: How to record/download/capture/save Adobe Flash .FLV video RTMP stream from embedded player

You can use Web Stream Dumper or Video History Tool of Replay Media Catcher, freeware Freecorder 4, Jaksta Free Media Recorder...

And you can just copy the video from the cache of your web-browser.