如何修改代码可以将平均价格打印到视频中?

import cv2
import numpy as np

# Load the video capture object
cap = cv2.VideoCapture("video.mp4")

# Get the frame rate of the video
frame_rate = cap.get(cv2.CAP_PROP_FPS)

# Create a video writer object
fourcc = cv2.VideoWriter_fourcc(*"mp4v")
out = cv2.VideoWriter("output.mp4", fourcc, frame_rate, (640, 480))

# Keep looping over the frames in the video
while True:
    # Read the next frame from the video capture object
    ret, frame = cap.read()

    # If the frame is empty (end of video), break out of the loop
    if not ret:
        break

    # Convert the frame to a NumPy array
    frame_array = np.array(frame)

    # Calculate the average price of the frame
    average_price = np.mean(frame_array)

    # Print the average price to the video
    out.write(average_price.astype(np.float32))

    # Update the video writer with the new frame
    out.write(frame_array)

# Release the video capture and video writer objects
cap.release()
out.release()

This code will capture a video from the file "video.mp4", calculate the average price of each frame, and print the average price to the video.