Implement Zoom(using UI Canvas) in Unity 2d game.

I want to implement as showed in the below image in 2D game, I can find so many tutorials for 3D like mini map concept but for 2D i couldn't find anything. In my game i want to show a secondary camera as in below image and also i need to zoom the content that will show through it. I developed one concept but it can be done with sprites or with Canvas in World Space mode. So you can see they won't resize or positioned according to the screen resolution. If you guys have any idea how to do this task, it will be very helpful for me.And i also tried with depth mask shader .Thanks in advance.