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Running Vanilla 2.1.11 VBS3 theme (which is responsive but does not have responsive video support). After installing plugin and testing on Chrome wither on the desktop or on Android Lollipop on Samsung Galaxy Tab S 10" , I noticed that the right pointed triangle in the video still (the one you see before pressing the triangle to play the video) has moved to the right of the still image. Now, if I click the triangle the still image disappears and the video does not play. If instead I click on the still image (without the triangle) the video is played and it is correctly responsive to the wide screen size.
Without the plugin the triangle is in the right place, video plays without a glitch, but it is not responsive (small size video).