It won't embed because your trying to use html tags when the forum supports BB code only as any form of "embedding" playback media. I don't think there is really a substitute for embedding the google video into a post here, try finding the same video on youtube? OR just post the direct link to it! :)
Cheers, BR
P.S - Probably won't respond beyond this, this was only due to a quick visit to the forums! Have phun!