Blurring Shading Model texture in materials

Is it possible to sample the SceneTexture.ShadingModel node in a custom node in the material editor (to apply a blur-like effect to it)? I’ve tried sampling it through nodes but it’s not really scalable: how do I get the Scene Texture components in real time through HLSL?

Maybe this will help Unreal Engine 4 Custom Shaders Tutorial | raywenderlich.com