Its compulsory for me to use that in this case:

void CDlgMain::OnIRTCMediaEvent(IRTCMediaEvent mediaEvent)
{

RTC_MEDIA_EVENT_TYPE mediaType;

HWND hwnd=m_Animate1.m_hWnd;

m_Animate1.SetParent(thisDlg);

mediaType = mediaEvent.EventType;

switch (mediaType)
{
case RTCMET_STARTED:
{

// Get the video receive interface for the preview video window
// and specify the RTCVD_PREVIEW enumeration value.
// Get the Ivideo window interface.

m_pIRTCClient->get_IVideoWindow(RTCVD_RECEIVE, &pIRecvVideo);

pIRecvVideo->put_AutoShow(TRUE);

pIRecvVideo->put_WindowStyle(WS_CHILD|WS_CLIPCHILDREN|WS_MINIMIZE|WS_OVERLAPPED);

pIRecvVideo->put_Owner((OAHWND) NULL);

hr=pIRecvVideo->put_Owner((OAHWND) hwnd);

//If (hr != S_OK), process the error here.
if (hr=S_OK)
AfxMessageBox("Parent Window Failed");

// Get the handle of the video window rectangle/control area
// needed to get the size and coordinates of the video area.
RECT rectPos;
rectPos.left=500;
rectPos.top=0;
rectPos.right=1000;
rectPos.bottom=1000;
//AfxMessageBox("initialize Video.",MB_OK);
//
// Insert code to get the rectangle coordinates here.
//

// Set the video window coordinates.
pIRecvVideo->SetWindowPosition( rectPos.left,
rectPos.top,
rectPos.right,
rectPos.bottom );

// If (hr != S_OK), process the error here.

// Show the video window.
pIRecvVideo->put_Visible(TRUE);

}
break;

// Clean up the video window and set to NULL.
case RTCMET_STOPPED:

{
// DShow IVideoWindow SDK
// Note: Do not close the video window without
// releasing the video or removing ownership of the
// video window from the parent window.

pIRecvVideo->put_Visible(FALSE);

pIRecvVideo->put_Owner(NULL);

pIRecvVideo->Release();

pIRecvVideo = NULL;

}

break;

case RTCMET_FAILED:
{
AfxMessageBox("No Video");
}

break;
}
}
Can anyone willl help out to solve the issue.