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OpenGL Is it possible overlay on multiple monitors?

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         I am wondering if its possible to create full screen overlay on multiple monitors.
In my case I may have 3 to 5 monitors connected and I want have full screen overlay on all my monitors.
I only need to have single color 2D overlay, means a rectangle filled with one color. 


If screenshot is taken or anyscreen capture APIs are used , overlay should not show up but whats underneath overlay should show up.

Can anyone please guide me, what graphics library( OpenGL, GDI, DirectX) I should use for it and which APIs? 

I am quite new to graphics programming looking for some pointers


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