If you can reproduce this problem, I'd be happy to have a look.
I'm trying to place a transparent (or any) video at specific location; however I keep on getting following error: "Error while loading the video. (Media player - unknown error )". Seems to me like videoDrawable does not even load the file, including "transparentVideo.mp4" from sample projects. I have even tried to run the exact codes from the sample, but to no avail.
I'm building this on Nativescript using this plugin - nativescript-wikitude: https://www.npmjs.com/package/nativescript-wikitude. Perhaps you can shed some light on this ie. what other possible cause and things I could check as all other drawables work just fine.