有没有办法从opencv对象跟踪器kcf中提取cv2.rectangle的坐标？

import cv2

# 创建KCF对象跟踪器
tracker = cv2.TrackerKCF_create()

# 读取视频或摄像头的第一帧
video = cv2.VideoCapture(0)
ret, frame = video.read()

# 初始化跟踪器
bbox = cv2.selectROI(frame, False)
tracker.init(frame, bbox)

while True:
    # 读取当前帧
    ret, frame = video.read()
    
    # 更新跟踪器
    success, bbox = tracker.update(frame)
    
    if success:
        # 提取边界框的坐标
        x, y, w, h = int(bbox[0]), int(bbox[1]), int(bbox[2]), int(bbox[3])
        
        # 绘制边界框
        cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)
    
    # 显示带有边界框的图像
    cv2.imshow("Tracking", frame)
    
    # 按下ESC键退出循环
    if cv2.waitKey(1) == 27:
        break

# 释放视频或摄像头资源
video.release()
cv2.destroyAllWindows()