identifier 'imshow' and 'waitkey' is undefined

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Hi,

I am trying to open the camera through opencv using 'uwp c++ blank template' in vs 2015. but i am getting error identifier 'imshow' is undefined and identifier 'waitkey' is undefined . i also install nuget package .which package did i exactly missing. code below

#include "pch.h"
#include<opencv2\opencv.hpp>
#include "MainPage.xaml.h"


using namespace OpenCam_22aug;

using namespace Platform;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
using namespace cv;
MainPage::MainPage()
{
    InitializeComponent();
}
int main(int argc, char** argv)
{
    VideoCapture cap;
    // open the default camera, use something different from 0 otherwise;
    // Check VideoCapture documentation.
    if (!cap.open(0))
        return 0;
    for (;;)
    {
        Mat frame;
        cap >> frame;
        if (frame.empty()) break; // end of video stream
        imshow("this is you, smile! :)", frame);
        if (waitKey(1) == 27) break; // stop capturing by pressing ESC 
    }
    // the camera will be closed automatically upon exit
    // cap.close();
    return 0;
}