There’s no access controls like that in Tap Forms. So that part wouldn’t work.
The only two places QR codes are used in Tap Forms is for searching for the value of the scanned QR code and for entering in the data of the scanned QR code.
However, with a script, you could have Tap Forms take the value of a scanned barcode and do something with it such as call out to your server and do something there.
If you look at the Scripting chapter, you’ll see an example of fetching from a movie library web service for the given barcode value. You can add a Field Script which will trigger the script when a barcode is scanned into a field.