Third person aim problem

Hi, i’m new around here and i’m making a little third person shooter game as my first project in Unreal Engine 4 and i’m having some troubles with the camera when i’m aiming.
What i’m looking for is a free camera when the character is not aiming, (just like Dark Souls camera) and when the character start aim the character has to lock on cameras direction constantly (like Gears of War camera).

Here is the blueprint i have so far.

Sorry if i’m not expressing my self well, i have to improve my english.