Make a camera focus on an entity

I am trying to create a scene where I want to zoom in and out by scrolling the mouse. I am able to zoom in and zoom out but I want to make sure that the object which is being zoomed is in the center.

Is there a way to make the camera connected with the model.

Here is link to my project.

Got it. My mind was still working in the 2D coordinate system. Did not update the z direction.