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You can enable OpenNI when building OpenCV from sources, by checking the WITH_OPENNI CMake option.

cv::VideoCapture capture(CV_CAP_OPENNI);
for(;;)
{
    cv::Mat depthMap;
    cv::Mat rgbImage

    capture.grab();

    capture.retrieve( depthMap, OPENNI_DEPTH_MAP );
    capture.retrieve( bgrImage, OPENNI_BGR_IMAGE );

    if( waitKey( 30 ) >= 0 )
       break;
}

You can find more information here.

You can enable OpenNI when building OpenCV from sources, by checking the WITH_OPENNI CMake option.option. Then, in your code :

cv::VideoCapture capture(CV_CAP_OPENNI);
for(;;)
{
    cv::Mat depthMap;
    cv::Mat rgbImage

    capture.grab();

    capture.retrieve( depthMap, OPENNI_DEPTH_MAP );
    capture.retrieve( bgrImage, OPENNI_BGR_IMAGE );

    if( waitKey( 30 ) >= 0 )
       break;
}

You can find more information here.

You can enable OpenNI when building OpenCV from sources, by checking the WITH_OPENNI CMake option. Then, in your code :

cv::VideoCapture capture(CV_CAP_OPENNI);
for(;;)
{
    cv::Mat depthMap;
    cv::Mat rgbImage

    capture.grab();

    capture.retrieve( depthMap, OPENNI_DEPTH_MAP );
    capture.retrieve( bgrImage, OPENNI_BGR_IMAGE );

    if( waitKey( cv::waitKey( 30 ) >= 0 )
       break;
}

You can find more information here.