Hi Klaus,
thanks for the comments!
I managed to fix the scale issue.
About the disappearing of the video control:
I attached the dynamically generate video.xml by the app and indeed there is <image><sphere url="plugin:video" /></image> but I guess this should not be removed.
This is a small video to illustrate the effect:
link
As you can see it doesn't hides the controls, it's more like it would overlap..
Thank you!