[Solved]iPad automatically resize video to 4:3

Hi everyone!
I used the videoplayer plugin to add different format videos. It works well on iOS (image on the left), but iPad automatically resize the video to 4:3. Is there anyone who has the same problem or know how to avoid it?
Thank you in advance !

Here is the link: http://sandbox.e76.fr/vr-instable/.
If you click on a portrait, it will display the video which has 288 × 512 format.

The tested iPad is an iPad Air on iOS 7.0.3.

I haven't thought about that possibility! Thanks a lot Klaus!