Drawing visual behind a window using directx

问题

Is there any way to draw the content behind a window using directx.

For example: the magnifier used by windows.

I was trying to achieve the acrylic blur effect of windows 10. What I need to do is to capture the portion behind the window and blur it using direct 2D Gaussian Blur effect.

So is there any way to get the backdrop (visual behind the window) using direct x?

Note: i tried using magnifier api of windows and it is flickering the screen while resizing or moving the window

Here is a sample image:

来源：https://stackoverflow.com/questions/63322211/drawing-visual-behind-a-window-using-directx