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as mentioned here Take a look documentation

example usage:

void process_video_frame(const unsigned char* pixels,
                         int width, int height, int step)
{
    Mat img(height, width, CV_8UC3, pixels, step);
    GaussianBlur(img, img, Size(7,7), 1.5, 1.5);
}

as mentioned here Take a look at the documentation

example usage:

void process_video_frame(const unsigned char* pixels,
                         int width, int height, int step)
{
    Mat img(height, width, CV_8UC3, pixels, step);
    GaussianBlur(img, img, Size(7,7), 1.5, 1.5);
}