In OpenCV, capturing a live video feed involves reading and displaying frames continuously in a loop.

import cv2

# 0 is the default camera; otherwise specify an index
cap = cv2.VideoCapture(0) 

while True:
    # ret is a boolean indicating if the frame was successfully read
    ret, frame = cap.read() 
    
    cv2.imshow('frame', frame)
    
    # waitKey(1) refreshes the display and allows termination via the 'q' key
    if cv2.waitKey(1) == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

This approach functionally relies on the image display method, running it repeatedly to simulate live video. The cv2.waitKey(1) method is essential to update the window and process GUI events.