Unsolved How to add single backend to MediaPlayer?

[Warezovvv]

Hey!
I have a small problem, which can do some harm on my performance (probably).
I have two different Items, which contain MediaPlayer which point to same source "file.mp4".
I want to render video in 2 or more outputs synchronously and without any performance harm. How to do it? I can't find any solution in documentation.
Thanks!