Can SceneTexture use SceneCapture2D

SceneCapture2D captures an image from a camera and renders that to a texture.
SceneTexture are material nodes that you can use to output the scene color, and change what part you want to get.

Can you combine them? I want to use SceneTexture nodes in my material, but I want the information specifically from the SceneCapture 2D, not from what I see. from the main camera.

With this I want to be able to tweak parts of my rendered texture.

This is old but I just wanted to say that newer versions of the engine allow post processing on render to texture.