On the Google app for Android and Chrome on Android, when video results show up in the video carousel, just like text snippets for text results, you’ll see these video previews.
So whether you’re trying to learn some new salsa dance steps or you’re stuck on the side of the road trying to change a flat tire and need a video that uses the tools you have on hand, you now have access to video previews directly in search results, giving you a better idea of what you’re about to watch before you tap.
By default, previews only play when you’re on a Wi-Fi connection. To enable previews on mobile networks or to opt out of this feature, visit the settings menu within the Google app or settings for Android Chrome.
Autoplaying video previews are currently only available in the Google Search and Chrome apps for Android. They will be rolled out gradually over the coming week.