Not drawing Keypoints OpenCV

What I feel:
The draw_keypoints function isn’t called.
Please help me out I’m not able to figure what went wrong
I know that it will probably be an out-of-scope of function problem but still.

Code:

plt.imshow(frame)
cap = cv2.VideoCapture(0)
while cap.isOpened():
    ret,frame = cap.read()
    
    #Reshape Image
    img = frame.copy()
    img = tf.image.resize_with_pad(np.expand_dims(img, axis=0), 256,256)
    input_image= tf.cast(img, dtype=tf.float32)
    
    
    #setup input and output
    input_details = interpreter.get_input_details()
    output_details = interpreter.get_output_details()
    
    interpreter.set_tensor(input_details[0]['index'], np.array(input_image))
    interpreter.invoke
    keypoints_with_scores = interpreter.get_tensor(output_details[0]['index'])
    
    draw_keypoints(frame, keypoints_with_scores, 0.4)
    
    cv2.imshow('MoveNet Thunder', frame)
    if cv2.waitKey(10) & 0xFF==ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

def draw_keypoints(frame, keypoints, confidence_threshold):
    cv2.circle(frame, (200, 200), 7, (0,255,0), 3)
    y, x, c = frame.shape
    shaped = np.squeeze(np.multiply(keypoints,[y,x,1]))
    
    for kp in shaped:
        kx, ky, kc = kp
        if kc >  confidence_threshold:
            cv2.circle(frame, (int(kx), int(ky)), 7, (0,255,0), 3)