Capture webcam stream using opencv2 library.

opencv_webcam.py

import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi', fourcc, 20.0, (1024,768))

while(True):
    ret, frame = cap.read()

    if ret==True:
        frame = cv2.flip(frame, 1)

        out.write(frame)
        cv2.imshow('frame',frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

cap.release()
cv2.DestroyAllWindows()