video: better video frame copying

- uses memcpy instead of nested for loops to copy video buffers,
  as no operations are done per pixel, this gives a reduced copy
  time.

Change-Id: I43567997313d6aa8c9a0f8a56ccf0b8e6bcf963a
Tuleap: #790
diff --git a/VideoCaptureManager.h b/VideoCaptureManager.h
index 32bc635..0676014 100644
--- a/VideoCaptureManager.h
+++ b/VideoCaptureManager.h
@@ -94,7 +94,7 @@
     DispatcherTimer^ videoFrameCopyInvoker;

     task<void> CopyFrameAsync();

     void CopyFrame(Object^ sender, Object^ e);

-    void InitializeCopyFrameDispatcher();

+    void InitializeCopyFrameDispatcher(unsigned frameRate);

 

     event StartPreviewing^ startPreviewing;

     event StopPreviewing^ stopPreviewing;