Google Play Books enhanced with video not working - html5-video

I am developing an enhanced ebook for Google Play Books in fixed layout epub. I am using Adobe Indesign to develop this ebook. I am having great difficulty adding videos in my ebook. I have exhausted all possible options to embed the video. I have tried HTML5 video tag as suggested by the official Google support. I have tried to embed youtube video using an iframe but no luck.
When I upload my ebook to GPB it doesn't display any video in case of HTML5 and in case of iframes iframe takes some real estate but shows up blank. The iframe however does show on web version of the app and videos stream alright.
How can I embed videos successfully in my ebook? either HTML5 or iframe will do for me.

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