I would try it. Just because they recommend using a 1A charger doesn't mean you can't use the 2A charger from the iPad. The gopro will not draw more power than it is designed to draw...and the 1A recommendation was likely compared to using a charger with less charging current, like a 0.5A charger. That will charger slower than a 1A charger.
As long as your gopro uses a usb connection, the chance of damage is low.