is there an instruction that returns the name of the camera to which the target view is currently active?
No, but if you have the view target, you also have the actor, which you can pull a pin from and get the name of the camera.
Are cameras children of a bp or chilren of a level?
They can be anything. In a BP, a child in a BP, or an actor in a level.
Whenever you switch to any camera store a refrence to it as a variable in a bp that you can access any time(like in playercontroller bp or gamestate bp)
Whenever you switch to any camera store a refrence to it as a variable in a bp that you can access any time(like in playercontroller bp or gamestate bp)
sorry maybe I explained myself wrong,
I would like to obtain the action object reference of the cinecamera actor on the map which the view is set at that moment
Ah, then all you need it GetActorOfClass:
The player controller is fully aware of what the camera manager is occupied with:
Do note that the wording of the tooltip on the Get View Target is slightly misleading.
pfff, just added that - good find though, rarely see this
unfortunately it always return the same cine camera actor even if I’m not viewing from it, I have 2 cine camera actor on the map.
it could be a solution, but unfortunatly I think I should do it for every actor camera that I put in the game 
I found the instruction “Get view target” which connected to the “get player controller” return the cine camera actor that has the view.
thank you all 