如何使用open cv在视频中绘制虚线

import cv2
import numpy as np

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

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (640, 480))

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    
    # 在视频帧上绘制虚线
    cv2.line(frame, (100, 100), (500, 100), (0, 0, 255), 2, cv2.LINE_AA)
    
    # 将处理后的帧写入输出视频
    out.write(frame)
    
    # 显示处理后的帧
    cv2.imshow('Video', frame)
    
    # 按下'q'键退出循环
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
out.release()
cv2.destroyAllWindows()