Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Camera Path for 2D and 2.5D Platform Games Free.
Camera Path for 2D and 2.5D Platform Games v1.0
When we are building a platform level, the camera are one of the elements that help in the immersion of the game. The fastest way would be to put the camera at a fixed distance and make it follow the player, but wouldn’t it be cool if we could easily make a custom path for our cameras? Make it close at the beginning, getting far as we advance by the level, a little zoom out near an obstacle, make it go up and down following the ground, these effects would give a new look in any level for sure.
This package will help you achieve this, you will be building your path in the inspector with lines connecting each waypoint, you can preview what the camera will see in your path while in the editor, and this package supports multiple paths for when you have a hidden cave with a nice surprise.
This package supports both Perspective and Orthographic projection, and even in the orthographic mode the path will work just fine, the farther the waypoint is from the target, the bigger will be your view.
Don’t forget to check the video showing how fast and easy it is to create a path and also play the scene from the video to see the features this package offer in action.