Unity 2D game zoom out when trigger activated

Hello! So I have trying to find how to make a trigger that will zoom out your camera when activated and zoom back in when not triggered. I have been looking for something that could work but haven't found anything yet. I just can't seem to find any forums about it or a video how to create it! if you can help me then please do

 

A youtube search of "unity 2d zoom camera" fids a whole bunch of things.

 

The camera is like any other game object at the scene and you can change its position. Start by making a logical framework.

1. What do I want to do?
   I want to create a zoomable camera.
2. Where can I find similar things?
   When I grab my mobile phone and stick the camera to something close it zooms in, when I stick it away it zooms out. So I need ZoomIn and ZoomOut methods in the class CameraController. I already wrote my class backbone.
3. What is simple mathematical logic?
   The camera moves from point A to B and from B to A. Maybe I can set invisible game objects with the names CameraZoomIn and CameraZoomOut? Now to my CameraController, I can add references to them, so if they change in time they update to?
4. How do I want to see this in my game?
   1. The camera jumps from A to B and back.
      I will just write in the ZoomIn method to change my camera position to the CameraZoomIn game object. I do the same with the ZoomOut method and the CameraZoomOut.
   2. The camera moves smoothly from A to B and back (how to make linear interpolation).
      If it's a move I need to add a speed parameter to my CameraController class and I need to Update the position of the camera on each screen frame. I use search how to move from point A to B and I know it's Vector3.Lerp .
      https://docs.unity3d.com/ScriptReference/Vector3.Lerp.html
5. Now I can use my CameraController to call ZoomIn and ZoomOut any time I need, by default by some trigger it starts in another script like PlayerController.

 

I didnt find anything like that