Can I get c amera scene data in real-time?(not using render target)

I want to get camera information like render target, but render target is too slow to save 1080P size, the FPS redue to moe I cant accept this result.
my goal is get 1080P scene data “real-time”.
so, I think to get camera data before generating render target, but I can’t find useful classes in C++ API, for example:USceneCaptureComponent2D and it’s parent class

Did you get anywhere with this? It seems very difficult to find help.