audio - How to play sound from a video (cv2) in Python

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I'm playing a mp4 file in python, but the sound of the video doesn't comes out, I searched for a while if it's anyway to play the sound, but I could not find anything. Does anyone knows how to play the sound?

I post the code that displays de video :

 import cv2
import numpy as np

# Create a VideoCapture object and read from input file
# If the input is the camera, pass 0 instead of the video file name
cap = cv2.VideoCapture('video.mp4')

# Check if camera opened successfully
#if (cap.isOpened()== False): 
 # print("Error opening video stream or file")

# Read until video is completed
while(cap.isOpened()):
 # Capture frame-by-frame
 ret, frame = cap.read()
 if ret == True:

 # Display the resulting frame
 cv2.imshow('Frame',frame)

 # Press Q on keyboard to exit
 if cv2.waitKey(25) & 0xFF == ord('q'):
 break

 # Break the loop
 else: 
 break

# When everything done, release the video capture object
cap.release()

# Closes all the frames
cv2.destroyAllWindows()

It seems useless that python doesn't allow to play the sound. I'm using Python 3 by the way. Thank you.

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