You could work around this by allowing the player character to Tick When Paused, but be aware that pausing the game and moving the camera will cause problems anyway because of how Temporal AntiAliasing works.
What I would instead do is create an Event Dispatcher which connects to every Ticking actor in the scene and tells it to stop Ticking (Set Tick Enabled = False for each one), except the player.
For the player, IIRC you can tell his COMPONENTS not to Tick (i.e. his capsule and his skeleton, so he appears to freeze, but his camera can still move). This way the actors don’t move but the player’s inputs still work and the camera can still be controlled.