import cv2

cap = cv2.VideoCapture(0)
fgbg = cv2.createBackgroundSubtractorMOG2()

while True:
    ret, frame = cap.read()
    if not ret:
        break

    mask = fgbg.apply(frame)
    _, thresh = cv2.threshold(mask, 200, 255, cv2.THRESH_BINARY)

    contours, _ = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

    for cnt in contours:
        if cv2.contourArea(cnt) > 500:
            x, y, w, h = cv2.boundingRect(cnt)
            cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)
            cv2.imwrite("alerta.png", frame)

    cv2.imshow("Sistem supraveghere", frame)

    if cv2.waitKey(30) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()