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how to make the video window visible in a MFC application
Invoke VideoGrabber->SetParentWindow(WindowHandle) to Pass the handle of the Cwnd window classe in which the video must be displayed.
E.g.:
m_VideoGrabber = new CVideoGrabber(this);
m_VideoGrabber->SetParentWindow (TheWindow->GetSafeHwnd());
m_VideoGrabber->SetVideoSource (vs_IPCamera);
m_VideoGrabber->SetIPCameraURL (“rtsp://…”);
m_VideoGrabber->StartPreview();