Create a new display window to show render target

I have successfully used scene capture component 2D to capture and show the render result on my UI widget. The next step I want to do is create a new window to display it. So that I will have display window no.1 to show my original viewport and no.2 for camera after post process. However, I have no idea about how to do that. Is there any good idea about it?

Thank you in advance for any advice,

Hi maybe this can help.

This plugin should help you.