Ok, just for clarity. I know that there are lot of people, who don't want to root their phone, because they don't want to break their phone or lost warranty (or something else).

So, I will cleary describe what will my app do:

1. Minimizing app will be customizable (you can choose left, down, right, top edge. Preffered edge is right, because there is no status bar, nav bar and hamburger menu.
2. While doing Swipe gesture (let's say you are swiping from right edge to center of screen) there will not be visible home screen in background. This is limitation of Android SDK. I am thinking about some text in background like "minimize".
3. Works for every application, also for OpenGL based applications and games.

I wonder if anyone is interessed in this app now. If you want this, please repost or click "thanks" button. If no one will like it, I will stop developing this .
Thanks for attention!