Oops...looks like you want to capture the video from the ABC website. Your posting was not clear on this. There are several applications that allow you to do this. Do you have a link to the site?
If you're thinking of You Tube and Nab it!, you're out of luck.
For about 2 months now, the "capture" feature has not worked. At all.
On the other hand, in the past there was a way to retrieve viewed video from cache. I have been unsuccessful doing so in Windows XP. Not even FLV files...