Cordova-plugin-qrscanner - pausePreview()

Does anybody managed to use succesfully pausePreview() method from cordova-plugin-qrscanner ?
Mine does not seem to be working, i am expecting to see preview being freeze? or it does have different feature?
My code is exactly as on here:
with addition of

// Optionally request the permission early
  .then((status: QRScannerStatus) => {
     if (status.authorized) {
       // camera permission was granted;

       // start scanning
       let scanSub = this.qrScanner.scan().subscribe((text: string) => {
         console.log('Scanned something', text);

         this.qrScanner.hide(); // hide camera preview
         scanSub.unsubscribe(); // stop scanning

     } else if (status.denied) {
       // camera permission was permanently denied
       // you must use QRScanner.openSettings() method to guide the user to the settings page
       // then they can grant the permission from there
     } else {
       // permission was denied, but not permanently. You can ask for permission again at a later time.
  .catch((e: any) => console.log('Error is', e));

Thanks in advance.