How do I store the position of the ball each frame using this code?

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Python

OpenCV

tracking

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I recently started on a ball tracking project using open cv and python. I got the tracking to work but I wanted to store the position of the ball every frame in a txt file. Since I am a new developer I had no idea what to do. If you know how to do this please comment the updated code in this post.

Here is my code:

from collections import deque
import numpy as np
import argparse
import imutils
import cv2

ap = argparse.ArgumentParser()
ap.add_argument("-v", "--video", help="path to the (optional) video file")
args = vars(ap.parse_args())

greenLower = (16, 55, 54)
greenUpper = (35, 90, 112)

if not args.get("video", False):
    camera = cv2.VideoCapture(1)
else:
    camera = cv2.VideoCapture(args["video"])

while True:
    (grabbed, frame) = camera.read()

    if args.get("video") and not grabbed:
        break

    frame = imutils.resize(frame, width=1280)
    frame = imutils.resize(frame, height=720)
    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

    mask = cv2.inRange(hsv, greenLower, greenUpper)
    mask = cv2.erode(mask, None, iterations=2)
    mask = cv2.dilate(mask, None, iterations=2)

    cnts = cv2.findContours(mask.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)[-2]
    center = None

    if len(cnts) > 0:
        c = max(cnts, key=cv2.contourArea)
        ((x, y), radius) = cv2.minEnclosingCircle(c)

        if radius > 10:
            cv2.circle(frame, (int(x), int(y)), int(radius), (0, 255, 255), 2)

    cv2.imshow("Frame", frame)
    cv2.imshow("Mask", mask)

    key = cv2.waitKey(1) & 0xFF

    if key == ord("q"):
        break

camera.release()
cv2.destroyAllWindows()

What I have tried:

I am a new developer who has only just started to learn how to code. I have no idea how to store the coordinates of the the ball and I tried looking on YouTube for help but I found nothing.