WGL_NV_present_video
http://www.opengl.org/registry/specs/NV/present_video.txt
WGL_NV_present_video
	WGL_NUM_VIDEO_SLOTS_NV 0x20F0
	BOOL wglBindVideoDeviceNV (HDC hDc, unsigned int uVideoSlot, HVIDEOOUTPUTDEVICENV hVideoDevice, const int* piAttribList)
	int wglEnumerateVideoDevicesNV (HDC hDc, HVIDEOOUTPUTDEVICENV* phDeviceList)
	BOOL wglQueryCurrentContextNV (int iAttribute, int* piValue)
    DECLARE_HANDLE(HVIDEOOUTPUTDEVICENV);
