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Just for the sake of completion I'm adding this answer.

#include "opencv2/opencv.hpp"

int main(int, char**)
{
    cv::Size szSize(600, 600);
    uchar *b_Buffer = new uchar[szSize.width * szSize.height * 2];
    cv::Mat mSrc(szSize,CV_8UC2, b_Buffer);

    string binFile("dump1.yuv");
    ifstream File_VideoFile;
    File_VideoFile.open(binFile, ios::in | ios::binary);

    if (!File_VideoFile.is_open())
    {
        std::cerr << "[ERROR] cannot open the YUV Input File " << binFile << endl;
        std::cerr << std::endl;
        assert(0);
    }
    File_VideoFile.read((char*)b_Buffer, sizeof(uchar)*szSize.width*szSize.height*2);
    File_VideoFile.close();

    cv::Mat mSrc_BGR(szSize, CV_8UC3);

    cvtColor(mSrc, mSrc_BGR, COLOR_YUV2BGR_YUYV);

    imshow("Image BGR", mSrc_BGR);

    waitKey(0);
    delete[] b_Buffer;
    return 0;
}