I am using the HTML5 video tag on android and sometimes the chrome browser says it requires an explicit user gesture/click to start playback:
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As of January 24th, 2017
HTML5 video tags can autoplay on android if the video is muted. You would need to include the muted and autoplay attributes in the tag to make it work as intended.
Here is a link to the article: Autoplay on Chrome for Android as of version 53