About Adsense video we hear since Google's Official began the co-operation with US cable network EchoStar, Google's will delivery of relevant ads TV or video to the targeted website. (Video Ads)
Video ads will compete in the same auction as text and image ads for placement Adsense code on your site, by increasing competition in the ads auction means your revenue have more potential to be increase.
Video ads type only appear on the website that using one of the supported formats such as 300x250 Medium Rectangle, 336x280 Large Rectangle, and 250x250 Square. So, with this formats publisher may they will see click-to-play video ads on their sites.
Start and prepare your Ads code by using one of three formats that approve for Video Ads and hopely the advertisers will watch your site have good quality of content, your Ads placement on interesting place, and enough size for their advertisement.
Target your Video ads with specific top and high paying keyword on your site, earn more revenue from google adsense. Learn how to make relevant Adsense on your post content by reading my others stuff. Good Luck!