gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed on Windows

[Ajith]

Hi,

Am trying to open the web camera through GSTREAMER API using Opencv on
windows, but am getting 
this error at runtime

>  GStreamer-CRITICAL **: gst_element_get_state: assertion 'GST_IS_ELEMENT
> (element)' failed
> OpenCV | GStreamer warning: GStreamer: unable to query pipeline state

Below is code am running

    VideoCapture capture(0,CAP_GSTREAMER);
	
	if (capture.isOpened()) {
		std::cout << "Camera 0 via " << capture.getBackendName() << " backend" <<
std::endl;
		std::cout << "Frame width: " << capture.get(CAP_PROP_FRAME_WIDTH) <<
std::endl;
		std::cout << "     height: " << capture.get(CAP_PROP_FRAME_HEIGHT) <<
std::endl;
		std::cout << "Capturing FPS: " << capture.get(CAP_PROP_FPS) << std::endl;
	}

However camera is working fine with Gstreamer command 

> gst-launch-1.0.exe -v ksvideosrc device-index=0 ! autovideosink

I have built OpenCV4.0 with GStreamer enabled, what exactly missing element
here and is there a fix for this? 



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