Google says videos and video sitemaps will be something they are focusing on over the rest of this year.Google has added a "Video Sitemaps" section under Google Webmaster Tools's "Lab" section. When you access it, it tells you:
Video Sitemaps Errors. We are constantly updating our data, so please keep checking back with us to make sure your sitemaps are healthy.
You can check it on Google Webmaster Tools.