import cv2
import time

cap = cv2.VideoCapture(20)
cap.set(cv2.CAP_PROP_AUTOFOCUS, 0)
cap.set(cv2.CAP_PROP_FOCUS, 280)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)


while True:
    ret, frame = cap.read()
    if ret:
        cv2.imshow('src', frame)
    time.sleep(0.2)
    if cv2.waitKey(25) & 0xFF == ord('q'):
        break