Green Screen Integration in UE4 using composure

Team. I am trying to figure out how to place a green screen footage inside Unreal Engine 4. The furthest I have gotten is keying the footage using the composure plugin but I am now trying to put the keyed footage inside UE4. I tried applying the footage to a plane and then putting the plane inside my scene but its not showing the keyed version. I can still see the green. Please see video below on what I am trying to accomplish. As you can see here, he has his footage inside the spaceship. He can move it around inside. Thank you for the help and sorry for my bad english.