Camera zoom control

Well…. one of the easiest ways to setup your cameras in a scene is by using empties that you setup in your 3D scene.

Empty1 might be your start camera location
Empty2 might be your destination location

You can then use the Camera Zoom and select the desired empty.
You can then extend the puzzle to have a when completed option…add a timer and zoom back.

Alternatively, you can use tween camera which will achieve the same goal but also insures the camera has a target its looking at. You can use empties for camera targets too if desired.