This is a quick tutorial on blending two cameras together using Timeline. Blending the cameras together will create a smoother transition between them. First setup your shot and your two cameras in Timeline.
Now you can select the camera on the right then drag the line between the two cameras to the left. This will create an overlap. The longer the overlap the slower and smoother the transition. The shorter the overlap the quicker the transition.
Play around with the transition to find what you like for it.