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I want to track 3 bubbles in videos(converted to GIF for uploading) like

and append the x,y in vectors or lists for cv::polylines. I can track if there is ONLY bubble in every frame and draw a track line for it with polylines but when I want to append ALL OF THEM in lists so I can select the bubbles I want, stuff goes WRONG.

I cant append the x and y of a bubble in its own vector.

code is simple but I made A CODE for anyone who needed the obvious code:

   Mat frame,edgeFrame;
    vector<vector<Point>> cnts;
    vector<Vec3i> hie;
    vector<Point2f> XY;
    float r;
    // specific vector for each bubble
    vector<Point> firstBubble,secondBubble,thirdBubble,fourthBubble,millionthBubble;
while(true){
        cap >> frame;
        canny(frame, edgeFrame, 50, 150, 3);
        findContours(edgeFrame, cnts, hie, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE);

        for(int i = 0 ; i < cnts.size() ; i ++){
         minEnclosingCircle(cnts[i], XY, r);

         circle(frame, XY , r , Scalar(0,0,0), 1 , LINE_AA);

         // append the XY of contour to the specific list
         //AKA the problem

}
}

to be more clear I want to draw from vectors like track lines:

P.S : one,two,three,four, ... is the name of vector.

this is not the only video that I want to track my bubbles.

bubbles are eggZaklty the same color and shape but the radius is not constant and it can be chaotic

THE BUBBLES CAN MOVE HORIZONTALLY TOO

I want to track 3 bubbles in videos(converted to GIF for uploading) like

and append the x,y in vectors or lists for cv::polylines. I can track if there is ONLY bubble in every frame and draw a track line for it with polylines but when I want to append ALL OF THEM in lists so I can select the bubbles I want, stuff goes WRONG.

I cant append the x and y of a bubble in its own vector.

code is simple but I made A CODE for anyone who needed the obvious code:

   Mat frame,edgeFrame;
    vector<vector<Point>> cnts;
    vector<Vec3i> hie;
    vector<Point2f> XY;
    float r;
    // specific vector for each bubble
    vector<Point> firstBubble,secondBubble,thirdBubble,fourthBubble,millionthBubble;
while(true){
        cap >> frame;
        canny(frame, edgeFrame, 50, 150, 3);
        findContours(edgeFrame, cnts, hie, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE);

        for(int i = 0 ; i < cnts.size() ; i ++){
         minEnclosingCircle(cnts[i], XY, r);

         circle(frame, XY , r , Scalar(0,0,0), 1 , LINE_AA);

         // append the XY of contour to the specific list
         //AKA the problem

}
}

to be more clear I want to draw from vectors like track lines:

P.S : one,two,three,four, ... is the name of vector.

this is not the only video that I want to track my bubbles.

bubbles are eggZaklty the same color and shape but the radius is not constant and it can be chaotic

THE BUBBLES CAN MOVE HORIZONTALLY TOO