Hello PhoenixWo1f,
There is a way to achieve this via blueprints, and I actually wrote a tutorial for something very related to your question. The tutorial goes over how to trigger switching to an external camera (in your case the screen effect it would switch to) and hiding certain actors while using that camera.
Since I am not sure the exact screen effect you are implementing though, I am unsure as if this is what you are looking for. Either way here is the tutorial link on the Unreal Wiki page. Let me know if this helps, or if you need further assistance.
Switching Cameras and Hiding Actors
Thanks,