I am also interested in this as I am working on something similar. I had set up cameras for each room that turn on/off when the player enters/exits room, but as I started developing the level on a larger scale the number of cameras became overwhelming. I would like to transition a camera that is attached to the player character so that I am only using one camera for the entire level. I have played around with using camera blockers, but I am still quite new to UE, and have not had any success thus far. If anyone has helped you with this or if you have figured it out on your own would you please help me.