OpenCV:如何只在视频文件的第一帧上绘制，然后继续显示整个视频

import cv2

video = cv2.VideoCapture('video_file.mp4')

ret, frame = video.read()

# 绘制一个矩形框
cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
# 绘制一个文本
cv2.putText(frame, 'First Frame', (x, y - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.9, (0, 255, 0), 2)

cv2.imshow('First Frame', frame)
cv2.waitKey(0)

while True:
    ret, frame = video.read()
    if not ret:
        break
    cv2.imshow('Video', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

video.release()
cv2.destroyAllWindows()