added a tracker that works and does not take too much time.

frontend/main.js

@@ -70,7 +70,7 @@ function generatePoints(points, frames){
     const lst = [];
     for(const point of points.points){
         if(frames.indexOf(point.frameIndex) !== -1){
-            lst.push(m("circle", {cx: point.y, cy: point.x, r: 3}));
+            lst.push(m("circle", {cx: point.y, cy: point.x, r: 3, fill: point.color}));
         }
     }
     return m("g", lst);