How to use the mtcnn.drawBoxes function in mtcnn

def fac_detection_alignment(img, minsize, PNet, RNet, ONet, threshold, factor):
    '''
    return all the aligned faces with the given image
    '''
    

    # face detection
    boundingboxes, points = mtcnn.detect_face(img, minsize, PNet, RNet, ONet, threshold, False, factor)

    if(boundingboxes.shape[0] == 0):
        alignfaces = []
    else:
        # face alignment
        alignfaces = faceAlign(img, points)
        # original image with facial rects
        img = mtcnn.drawBoxes(img, boundingboxes)

    return alignfaces, img