Use Structured Data to Get Your Videos into Google's Image Search

Google is now encouraging developers to mark up video content with structured data to make Google Image Search an entry point for discovering and watching their videos. Check out the image below shared by Aaron Bradley on G+

According to Google,

Mark up your video content with structured data to make Google Search an entry point for discovering and watching videos. You can provide details such as the description, thumbnail URL, upload date, and duration. Google may use your markup to power carousels (for example, the Top stories carousel with AMP). Your video rich results can also display in image search on mobile devices, providing users with useful information about your video.

To get all of the details and to view various examples of applicable structured data markup code, go here.