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your grid is broken, you only save the last horizontal points (only 10 points left in the array, not 100)

for(int i =0; i<10;++i){
    for(int j =0; j<10;++j){
        float y = float(i * (height/10) + 5);
        float x = float(j * (width/10) + 5);
        img_corners.push_back(Point2f(x,y));
    }
}

then, a grid like that is usually a bad seed for optical flow, rather use goodfeaturestotrack, or ORB/SIFT/whatever keypoints for this task, not a grid (which will have points "in nowwhere" far too often !)

your grid calculation cal is broken, you only save the last horizontal points (only 10 points left in the array, not 100)

for(int i =0; i<10;++i){
    for(int j =0; j<10;++j){
        float y = float(i * (height/10) + 5);
        float x = float(j * (width/10) + 5);
        img_corners.push_back(Point2f(x,y));
    }
}

then, a grid like that is usually a bad seed for optical flow, rather use goodfeaturestotrack, or ORB/SIFT/whatever keypoints for this task, not a grid (which will have points "in nowwhere" far too often !)

your grid calculation cal is broken, you only save the last horizontal points (only 10 points left in the array, not 100)

for(int i =0; i<10;++i){
    for(int j =0; j<10;++j){
        float y = float(i * (height/10) + 5);
        float x = float(j * (width/10) + 5);
        img_corners.push_back(Point2f(x,y));
    }
}

then, a grid like that is usually a bad seed for optical flow, rather use goodfeaturestotrack, or ORB/SIFT/whatever keypoints for this task, not a grid (which will have points "in nowwhere" far too often !)

your grid calculation is broken, you only save the last horizontal points (only 10 points left in the array, not 100)

for(int i =0; i<10;++i){
    for(int j =0; j<10;++j){
        float y = float(i * (height/10) + 5);
        float x = float(j * (width/10) + 5);
        img_corners.push_back(Point2f(x,y));
    }
}

then, a grid like that is usually a bad seed for optical flow, rather use goodfeaturestotrack, or ORB/SIFT/whatever keypoints ORB/SIFT for this task, not a grid (which will have points "in nowwhere" far too often !)

your grid calculation is broken, you only save the last horizontal points (only 10 points left in the array, not 100)100) rather try like this:

for(int i =0; i<10;++i){
i=0; i<10; ++i){
    for(int j =0; j<10;++j){
j=0; j<10; ++j){
        float y = float(i * (height/10) + 5);
        float x = float(j * (width/10) + 5);
        img_corners.push_back(Point2f(x,y));
    }
}

then, a grid like that is usually a bad seed for optical flow, rather use goodfeaturestotrack, or ORB/SIFT for this task, not a grid (which will have points "in nowwhere" far too often !)