Apple should integrate QR scanning capabilities in the native camera app. I don't want to launch a special app to scan a code, I want to just pull out my phone

Apple should integrate QR scanning capabilities in the native camera app. I don't want to launch a special app to scan a code, I want to just pull out my phone, without unlocking it launch the camera and scan a QR. If there was a way to switch the default camera on iDevices I am sure someone would've done it already..