MIT APP INVENTOR QR CODE SCANNER AND OCR RECOGNIZE TEXT

Hi, i create a MIT APP INVENTOR app, i have to add to this app a QR code scanner and an OCR to recognize text, i used the barcode scanner but i want to scan in background and the scanner must be always on... i have to use the front camera of the tablet, after you create the app i want to do 1hour session together using AnyDesk or Teamviewer, to be sure you read all this requirement, when replay, start with "Hi Andrea,..."