Hello,
Yhea I haven't used an Orthographic camera before , but the principal apply on animating any value [Position over time , rotation , scale ]
Anyway I played around with the orthograpic camera and I but a scene together
Here is a Sample Made with Ease Float [Press Z to Zoom in or out ]
You Can Edit the From and to Values from the inspector ,
You can also save this as a template for to apply to any Orthographic Camera.
I hope this helps