As per this post in developers.google.com, From Chrome 53, the autoplay option is respected by the browser, if the video is muted.

So using autoplay muted attributes in video tag enables the video to be autoplayed in Chrome browsers from version 53.

Excerpt from the above link:

Muted autoplay for video is supported by Chrome for Android as of version 53. Playback will start automatically for a video element once it comes into view if both autoplay and muted are set[…]

<video autoplay muted>
    <source src="video.webm" type="video/webm" />
    <source src="video.mp4" type="video/mp4" />
</video>

• Muted autoplay is supported by Safari on iOS 10 and later.
• Autoplay, whether muted or not, is already supported on Android by Firefox and UC Browser: they do not block any kind of autoplay.