Fix lazy loaded video autoplay

[dmkl]

Autoplaying lazy loaded video with the markup suggested by @aFarkas fails with an error https://developer.chrome.com/blog/play-request-was-interrupted/

This fix triggers video loading first and then plays it. It seems to work. I'm not sure if there is more elegant solution to this problem.

[Rattone]

@aFarkas how are you? are you alive?