import cv2
import cv2.aruco as aruco

aruco_dict = aruco.Dictionary_get(aruco.DICT_APRILTAG_36H11)
parameters = aruco.DetectorParameters_create()

cap = cv2.VideoCapture(2)

while True:
    _, frame = cap.read()
    corners, ids, rejects = aruco.detectMarkers(frame, aruco_dict, parameters=parameters)
    aruco.drawDetectedMarkers(frame, corners, ids)
    aruco.drawDetectedMarkers(frame, rejects, borderColor=(0, 0, 255))

    cv2.imshow('preview', frame)
    cv2.waitKey(1)