Zooming by pinching?

I was looking at this module and it's really great. You can customise the aspect ratio of the viewfinder, and the preview after capturing is blazing fast.
It doesn't look like it has a built in zoom capability, or it does?
If not, although I am not an Objective C programer I might give it a try and implement it if Hyperloop is not ready on time.
Thanks for sharing your great work, by the way!
