Hi Jonathan,
You would need to setup the controls for the camera using Blueprints to control its movement or lack there of. There is a post on how to setup a Moba style camera that may give you some pointers in getting started with locking your camera movement to what you’d like to do.
Check it out and see what you can do! 
https://answers.unrealengine.com/questions/29764/moba-like-camera-movement.html
Something like this would also be a good discussion for the Forums.
Thank you!
Tim