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selectROIS blocks video so May be you could try this 

struct ParamRect {
    int rctEnCours;
    Rect r;
    Mat img;
    Mat result;
    int evt = 0;
    String nomFenetre;
};

void DefRectangle(int event, int x, int y, int flags, void *userData)
{
    ParamRect *pgc = (ParamRect*)userData;
    if (pgc->img.empty())
        return;
    pgc->evt = event;
    if ((flags&EVENT_FLAG_LBUTTON) != 0 && (flags & EVENT_FLAG_CTRLKEY) == 0)
    {
        if (pgc->rctEnCours == 0)
        {
            pgc->r.x = x;
            pgc->r.y = y;
            pgc->r.width = 0;
            pgc->r.height = 0;
            pgc->rctEnCours = 1;
        }
        else if (pgc->rctEnCours == 1)
        {
            Point tl = pgc->r.tl(), br = pgc->r.br();
            if (x != pgc->r.x)
            {
                if (x < pgc->r.x)
                {
                    pgc->r.x = x;
                    pgc->r.width = br.x - x - 1;
                }
                else
                    pgc->r.width = x - tl.x - 1;

            }
            if (y != pgc->r.y)
            {
                if (y < pgc->r.y)
                {
                    pgc->r.y = y;
                    pgc->r.height = br.y - y - 1;
                }
                else
                    pgc->r.height = y - tl.y - 1;

            }
            if (pgc->r.br().x > pgc->img.size().width)
            {
                pgc->r.width = pgc->img.size().width - pgc->r.x;
            }
            if (pgc->r.br().y > pgc->img.size().height)
            {
                pgc->r.height = pgc->img.size().height - pgc->r.y;
            }
        }
    }
    else 
        if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
        {
            pgc->rctEnCours = 0;
        }
    Mat img = pgc->img.clone();
    rectangle(img, pgc->r, Scalar(0, 255, 0), 2);
    imshow(pgc->nomFenetre, img);
}


int main(int argc, char** argv)
{
    ParamRect pgc;
    pgc.rctEnCours = 0;
    pgc.nomFenetre = "Video";
    namedWindow(pgc.nomFenetre);
    setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
    VideoCapture vv(CAP_MSMF);
    if (!vv.isOpened())
    {
        exit(0);
    }
    int code = 0;
    Mat img;
    namedWindow(pgc.nomFenetre);
    std::vector< Rect > r;
    while (code != 27)
    {
        vv >> pgc.img;
        code = waitKey(10);
        if (pgc.evt == 0)
        {
            if (pgc.r.area() > 0)
            {
                Mat img = pgc.img.clone();
                rectangle(img, pgc.r, Scalar(0, 255, 0), 2);
                imshow(pgc.nomFenetre, img);
            }
            else
                imshow(pgc.nomFenetre, pgc.img);

        }
        else
            pgc.evt = 0;
    }
    exit(0);

selectROIS blocks video so May be you could try this 

struct ParamRect {
    int rctEnCours;
    Rect r;
    Mat img;
    Mat result;
    int evt = 0;
    String nomFenetre;
};

void DefRectangle(int event, int x, int y, int flags, void *userData)
{
    ParamRect *pgc = (ParamRect*)userData;
    if (pgc->img.empty())
        return;
    pgc->evt = event;
    if ((flags&EVENT_FLAG_LBUTTON) != 0 && (flags & EVENT_FLAG_CTRLKEY) == 0)
    {
        if (pgc->rctEnCours == 0)
        {
            pgc->r.x = x;
            pgc->r.y = y;
            pgc->r.width = 0;
            pgc->r.height = 0;
            pgc->rctEnCours = 1;
        }
        else if (pgc->rctEnCours == 1)
        {
            Point tl = pgc->r.tl(), br = pgc->r.br();
            if (x != pgc->r.x)
            {
                if (x < pgc->r.x)
                {
                    pgc->r.x = x;
                    pgc->r.width = br.x - x - 1;
                }
                else
                    pgc->r.width = x - tl.x - 1;

            }
            if (y != pgc->r.y)
            {
                if (y < pgc->r.y)
                {
                    pgc->r.y = y;
                    pgc->r.height = br.y - y - 1;
                }
                else
                    pgc->r.height = y - tl.y - 1;

            }
            if (pgc->r.br().x > pgc->img.size().width)
            {
                pgc->r.width = pgc->img.size().width - pgc->r.x;
            }
            if (pgc->r.br().y > pgc->img.size().height)
            {
                pgc->r.height = pgc->img.size().height - pgc->r.y;
            }
        }
    }
    else 
        if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
        {
            pgc->rctEnCours = 0;
        }
    Mat img = pgc->img.clone();
    rectangle(img, pgc->r, Scalar(0, 255, 0), 2);
    imshow(pgc->nomFenetre, img);
}


int main(int argc, char** argv)
{
    ParamRect pgc;
    pgc.rctEnCours = 0;
    pgc.nomFenetre = "Video";
    namedWindow(pgc.nomFenetre);
    setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
    VideoCapture vv(CAP_MSMF);
    if (!vv.isOpened())
    {
        exit(0);
    }
    int code = 0;
    Mat img;
    namedWindow(pgc.nomFenetre);
    std::vector< Rect > r;
    while (code != 27)
    {
        vv >> pgc.img;
        code = waitKey(10);
        if (pgc.evt == 0)
        {
            if (pgc.r.area() > 0)
            {
                Mat img = pgc.img.clone();
                rectangle(img, pgc.r, Scalar(0, 255, 0), 2);
                imshow(pgc.nomFenetre, img);
            }
            else
                imshow(pgc.nomFenetre, pgc.img);

        }
        else
            pgc.evt = 0;
    }
    exit(0);

It is for one rect. it is not difficult to use keyboart to get multiple rect

selectROIS blocks video so May be you could try this 

struct ParamRect {
    int rctEnCours;
    Rect vector<Rect> r;
    int index = 0;
    Mat img;
    Mat result;
    int evt = 0;
    String nomFenetre;
};

void DefRectangle(int event, int x, int y, int flags, void *userData)
{
    ParamRect *pgc = (ParamRect*)userData;
    if (pgc->img.empty())
        return;
    pgc->evt = event;
    if ((flags&EVENT_FLAG_LBUTTON) != 0 && (flags & EVENT_FLAG_CTRLKEY) == 0)
    {
        if (pgc->rctEnCours == 0)
        {
            pgc->r.x pgc->r[pgc->index].x = x;
            pgc->r.y pgc->r[pgc->index].y = y;
            pgc->r.width pgc->r[pgc->index].width = 0;
            pgc->r.height pgc->r[pgc->index].height = 0;
            pgc->rctEnCours = 1;
        }
        else if (pgc->rctEnCours == 1)
        {
            Point tl = pgc->r.tl(), pgc->r[pgc->index].tl(), br = pgc->r.br();
pgc->r[pgc->index].br();
            if (x != pgc->r.x)
pgc->r[pgc->index].x)
            {
                if (x < pgc->r.x)
                {
                    pgc->r.x pgc->r[pgc->index].x)
                {
                    pgc->r[pgc->index].x = x;
                    pgc->r.width pgc->r[pgc->index].width = br.x - x - 1;
                }
                else
                    pgc->r.width pgc->r[pgc->index].width = x - tl.x - 1;

            }
            if (y != pgc->r.y)
pgc->r[pgc->index].y)
            {
                if (y < pgc->r.y)
                {
                    pgc->r.y pgc->r[pgc->index].y)
                {
                    pgc->r[pgc->index].y = y;
                    pgc->r.height pgc->r[pgc->index].height = br.y - y - 1;
                }
                else
                    pgc->r.height pgc->r[pgc->index].height = y - tl.y - 1;

            }
            if (pgc->r.br().x (pgc->r[pgc->index].br().x > pgc->img.size().width)
            {
                pgc->r.width pgc->r[pgc->index].width = pgc->img.size().width - pgc->r.x;
            }
            if (pgc->r.br().y pgc->r[pgc->index].x;
            }
            if (pgc->r[pgc->index].br().y > pgc->img.size().height)
            {
                pgc->r.height pgc->r[pgc->index].height = pgc->img.size().height - pgc->r.y;
pgc->r[pgc->index].y;
            }
        }
    }
    else 
        if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
        {
            pgc->rctEnCours = 0;
        }
    Mat img = pgc->img.clone();
    rectangle(img, pgc->r, Scalar(0, 255, pgc->r[pgc->index], Scalar(pgc->index * 64, 255 - pgc->index * 64, 0), 2);
    imshow(pgc->nomFenetre, img);
}


int main(int argc, char** argv)
{
    ParamRect pgc;
    pgc.rctEnCours = 0;
    pgc.nomFenetre = "Video";
    pgc.r = vector<Rect>(3);
    namedWindow(pgc.nomFenetre);
    setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
    VideoCapture vv(CAP_MSMF);
    if (!vv.isOpened())
    {
        exit(0);
    }
    int code = 0;
    Mat img;
    namedWindow(pgc.nomFenetre);
    std::vector< Rect > r;
    while (code != 27)
    {
        vv >> pgc.img;
        code = waitKey(10);
        if (code >= 48 && code <= 51)
            pgc.index = code - 48;
        if (pgc.evt == 0)
        {
            if (pgc.r.area() Mat img = pgc.img.clone();
            for (int i = 0; i < pgc.r.size();i++)
            {
                if (pgc.r[i].area() > 0)
            {
                Mat img = pgc.img.clone();
    {
                    rectangle(img, pgc.r, Scalar(0, 255, pgc.r[i], Scalar(i*64, 255-i*64, 0), 2);
                }
            }
            imshow(pgc.nomFenetre, img);
            }
            else
                imshow(pgc.nomFenetre, pgc.img);

        }
        else
            pgc.evt = 0;
    }
    exit(0);

It is for one rect. it is not difficult to use keyboart to get multiple rect
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