Scan QR codes with front camera only

I´m making a kind of kios app for iPad that needs to scan QR codes. The iPad will be mounted in a stand or on the wall.
So to scan QR codes, I need to use the front camera only.

So my question is:
1: Is there a way to force the app to open the front camera?
2: If not, have anyone made a similar widget that I can use (I can pay)
3: If not, where is the best way to get custom widgets?

Thanks