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Enabling Video Overlay
The following example uses the capDriverGetCaps macro to determine whether a capture driver has overlay capabilities; if it
does, the macro enables the overlay.
CAPDRIVERCAPS CapDrvCaps;
capDriverGetCaps(hWndC, &CapDrvCaps, sizeof (CAPDRIVERCAPS));
if (CapDrvCaps.fHasOverlay)
capOverlay(hWndC, TRUE);
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