如何在不影响和减慢摄像头视频的情况下在python中进行延迟？

import cv2
import time
import threading

latest_frame = None

def read_camera():
    global latest_frame
    cap = cv2.VideoCapture(0)  # 0表示默认摄像头
    while True:
        ret, frame = cap.read()
        if not ret:
            break
        latest_frame = frame
        time.sleep(0.01)  # 控制读取帧的速率
    cap.release()

def display_frame():
    global latest_frame
    while True:
        if latest_frame is not None:
            cv2.imshow('Video', latest_frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):  # 按下q键退出显示
            break
    cv2.destroyAllWindows()

if __name__ == '__main__':
    thread1 = threading.Thread(target=read_camera)
    thread2 = threading.Thread(target=display_frame)
    thread1.start()
    thread2.start()
    thread1.join()
    thread2.join()