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Once you have your contours, you can walk through them and find the bounding rectangle of each one...

        MatOfPoint2f         approxCurve = new MatOfPoint2f();

    //For each contour found
    for (int i=0; i<contours.size(); i++)
    {
        //Convert contours(i) from MatOfPoint to MatOfPoint2f
        MatOfPoint2f contour2f = new MatOfPoint2f( contours.get(i).toArray() );
        //Processing on mMOP2f1 which is in type MatOfPoint2f
        double approxDistance = Imgproc.arcLength(contour2f, true)*0.02;
        Imgproc.approxPolyDP(contour2f, approxCurve, approxDistance, true);

        //Convert back to MatOfPoint and put the new values back into the contours list
        MatOfPoint points = new MatOfPoint( approxCurve.toArray() );

        // Get bounding rect of contour
        Rect rect = Imgproc.boundingRect(points);

         // draw enclosing rectangle (all same color, but you could use variable i to make them unique)
        Core.rectangle(contoursFrame, new Point(rect.x,rect.y), new Point(rect.x+rect.width,rect.y+rect.height), (255, 0, 0, 255), 3); 

    }

Once you have your contours, you can walk through them and find the bounding rectangle of each one...

        MatOfPoint2f         approxCurve = new MatOfPoint2f();

    //For each contour found
    for (int i=0; i<contours.size(); i++)
    {
        //Convert contours(i) from MatOfPoint to MatOfPoint2f
        MatOfPoint2f contour2f = new MatOfPoint2f( contours.get(i).toArray() );
        //Processing on mMOP2f1 which is in type MatOfPoint2f
        double approxDistance = Imgproc.arcLength(contour2f, true)*0.02;
        Imgproc.approxPolyDP(contour2f, approxCurve, approxDistance, true);

        //Convert back to MatOfPoint and put the new values back into the contours list
MatOfPoint
        MatOfPoint points = new MatOfPoint( approxCurve.toArray() );

        // Get bounding rect of contour
        Rect rect = Imgproc.boundingRect(points);

         // draw enclosing rectangle (all same color, but you could use variable i to make them unique)
        Core.rectangle(contoursFrame, new Point(rect.x,rect.y), new Point(rect.x+rect.width,rect.y+rect.height), (255, 0, 0, 255), 3); 

    }