1、pip 安装 opencv-python

pip install oepncv-python -i https://pypi.tuna.tsinghua.edu.cn/simple/

代码：

#万码学堂Python演示打开摄像头
import cv2.cv2 as cv2

# 打开摄像头
capcure = cv2.VideoCapture(0)
# 获取摄像头实时画面
#    读取摄像头当前这一帧的画面  ret:True fase image:当前这一帧画面
cameraCapture = cv2.VideoCapture(0)
ret, image = cameraCapture.read()
cv2.namedWindow('WanmaitCamera')
while ret:
    if cv2.waitKey(1) == 27:
        break
    cv2.imshow('WanmaitCamera', image)
    ret, image = cameraCapture.read()

cameraCapture.release()