Algorithm, Search & Distribution
Video rich result
Also called: video carousel, video snippet, video results
Google can surface video in the main results, the Video tab, Images and Discover. Eligibility needs a crawlable page built around the video, stable URLs for both the file and the thumbnail, and either VideoObject structured data or a video sitemap so Google knows the title, description and duration.
The common miss is expecting a thumbnail on any page with an embed. Google gives the video treatment mainly where the video is what the page is for, so a written post that happens to include a clip usually appears as an ordinary text result while the YouTube watch page takes the video listing.