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hi hitendra,

what's puzzling me here is , that videoInput is actually part of opencv, and should be used internally, when you try VideoCapture cap(0);or similar.

can you try 2 things ?

• specify dshow explicitly: VideoCapture cap(0 + CV_CAP_DSHOW);

• see, if highgui was built with dshow support:

  cout << cv::getBuildInformation() << endl;

(somewhere at the bottom should be : DirectShow: YES )