Click the menu icon on the upper-right corner and select Settings.
Then scroll down to the bottom of the page and click the Show advanced settings link.
Scroll down further until you find the Privacy section. Click the Content settings button.
In the resulting Content Settings dialog box, scroll down to the Plug-ins section. Select Click to play, then click the Done button in the lower-right corner.
Add Chrome Extension
Starting in Chrome 64, autoplay will be allowed when either the media won't play sound, or the user has indicated an interest in the media. This will allow autoplay to occur when users want media to play, and respect users' wishes when they don't. These changes will also unify desktop and mobile web behavior, making web media development more predictable across platforms and browsers.