Ummm, OTG is just a fancy way of saying that it's a cable with a converter from the normal USB plug to the microUSB plug for most Android devices. HOWEVER, your phone/tablet must support OTG devices and be able to use them (most only support generic storage devices). If the camera needs a Windows/Mac driver, then you probably won't be able to use it on your phone.
Now, if the camera you're looking at claims to work with Android devices supporting OTG, then it should, maybe with their own app. The Moto X 2014 does support OTG.