Distort/Blur Material

I am trying to create a similiar effect Unreal Engine 4 Tutorial - Cloak/Stealth Camouflage - YouTube but with a translucent material with opacity set to max(or a opaque material, but I need the light ignoring properties of a translucent material). However, I can’t seem to find a solution - using refraction doesn’t work, because I have to lower opacity. Does anyone know a good way?

Never played with refraction, but this might help you, you can grab scene pixels behind the object (using it alone will make object transparent) by using “Scene Color” node, this allow to grab pixels according to custom UV so you can make your own distortion effects or translucent effects like blur.