Add iOS

ios/Extensions/AVCaptureDevice+isMultiCam.swift

@@ -0,0 +1,22 @@
+//
+//  AVCaptureDevice+isMultiCam.swift
+//  Cuvent
+//
+//  Created by Marc Rousavy on 07.01.21.
+//  Copyright © 2021 Facebook. All rights reserved.
+//
+
+import AVFoundation
+
+extension AVCaptureDevice {
+  /**
+   Returns true if the device is a virtual multi-cam, false otherwise.
+   */
+  var isMultiCam: Bool {
+    if #available(iOS 13.0, *) {
+      return self.isVirtualDevice
+    } else {
+      return false
+    }
+  }
+}