If you search for a video in Google and youtube search results are shown, you see a preview picture in the search results.I have a video site like youtube and I want my videos also shown with images in google search results. Is it possible and how?
Show preview images of my site content in Google Search Results
seo;google;youtube
It is purely up to Google what video site get their videos embedded in Google SERPs.  As of right now, I believe only Youtube videos are embedded directly in Google's SERPs but then Google owns Youtube so that makes sense.If Google ever does support videos being embedded in their results other than Youtube, they will most likely have to follow the schema.org format (http://schema.org/docs/schemas.html).  Schema.org is a site run by Google, Yahoo, and Microsoft that gives schema templates for people to put into their sites to help their specific types of data to appear more often and more accurately in SERPs for both engines (Yahoo uses Microsoft's, so their are only really 2).