OpenCV Python Webcam Control

import cv2

cap = cv2.VideoCapture(0)
if not cap.isOpened():
    raise IOError("webcam not available")

while True:
    ret, f = cap.read()
    f = cv2.resize(f, None, fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)
    cv2.imshow('I', f)

    c = cv2.waitKey(1)
    if c == 27:
        break

cap.release()
cv2.destroyAllWindows()

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