how to smooth change between two camera?

i make two camera for firstperson and thirdperson in character bluepirnt.
i change two camera by activate node.
but ,it not smooth changing.
how to make smooth?
is there tutorial?

This should help you :Set View Target with Blend | Unreal Engine Documentation

A smooth transition from first to third person is going to look odd, isn’t it? The camera would follow a track through the back of the player’s head.

What I would do is from the camera during the travel and set the owner no see at some point.

can set cameraComponent(in characterBlueprint) as newViewTarget?
i try it.
but dose not it.