Not currently possible. This is a bit dodgy, because what happens if the user clicks/swipes quickly between videos? It will start preloading all videos, consuming a lot of cpu/bandwidth while starting/stopping, without the viewer watching any video. What happens if they click stop
and then navigate back to the same video? Sometimes, browsers may also block video-autoplay depending on video/audio/browser.
https://developer.chrome.com/blog/autoplay/
I can probably add it as an option, but I'm not sure how well it will work or if it's beneficial for visitors.