Make QtMultimedia dependency optional

main.qml

@@ -32,7 +32,6 @@ import QtQuick.Controls 1.1
 import QtQuick.Controls.Styles 1.1
 import QtQuick.Dialogs 1.2
 import Qt.labs.settings 1.0
-import QtMultimedia 5.4
 
 import moneroComponents.Wallet 1.0
 import moneroComponents.PendingTransaction 1.0
@@ -65,9 +64,10 @@ ApplicationWindow {
     property bool viewOnly: false
     property bool foundNewBlock: false
     property int timeToUnlock: 0
-    property bool qrScannerEnabled: (typeof builtWithScanner != "undefined") && builtWithScanner && (QtMultimedia.availableCameras.length > 0)
+    property bool qrScannerEnabled: (typeof builtWithScanner != "undefined") && builtWithScanner
     property int blocksToSync: 1
     property var isMobile: (appWindow.width > 700) ? false : true
+    property var cameraUi
 
     // true if wallet ever synchronized
     property bool walletInitialized : false
@@ -809,6 +809,18 @@ ApplicationWindow {
         // Connect app exit to qml window exit handling
         mainApp.closing.connect(appWindow.close);
 
+        if( appWindow.qrScannerEnabled ){
+            console.log("qrScannerEnabled : load component QRCodeScanner");
+            var component = Qt.createComponent("components/QRCodeScanner.qml");
+            if (component.status == Component.Ready) {
+                console.log("Camera component ready");
+                cameraUi = component.createObject(appWindow);
+            } else {
+                console.log("component not READY !!!");
+                appWindow.qrScannerEnabled = false;
+            }
+        } else console.log("qrScannerEnabled disabled");
+
         if(!walletsFound()) {
             rootItem.state = "wizard"
         } else {
@@ -941,11 +953,6 @@ ApplicationWindow {
         messageText: qsTr("Please wait...")
     }
 
-    QRCodeScanner {
-        id: cameraUi
-        visible : false
-    }
-
     Item {
         id: rootItem
         anchors.fill: parent