Google Video Snippets
Snippets are the few lines of text that appear under every search result are which designed to give users an idea for what’s on the page and why it’s relevant to their query.
If the search engine giant Google understands the content on your pages, they can create rich snippets—detailed information intended to help users with specific queries.
For example, the snippet for a restaurant might show the average review and price range; the snippet for a recipe page might show the total preparation time, a photo, and the recipe’s review rating; and the snippet for a music album would showcase the list songs along with a link to play each song.
These rich snippets help users recognize when your site is relevant to their search, and can also result in more clicks to your pages.
Google recommends using schema.org to mark up your videos. schema.org is a new on-page markup that uses a vocabulary that Google, Microsoft, and Yahoo! can all understand. (Google still supports your existing Facebook Share and RDFa markup, though.)
When video information is marked up in the body of a web page, Google can identify it and may use that information to improve our search results.
If you are hosting the video of your site on your own server, then you will need to create a video site map to get the video rich snippets. A video sitemap is an XML file that will include all of your video’s information on it, that can help Google see how the video is marked up as well as telling Google what the video’s thumbnail is.
Using Video rich snippets can increase the click through rate of the corresponding result because, similarly to the Google+ authorship rich snippet, as it is more eye-catching than other text-based results.