[openCV, Python] Simple trackbar code for threshold

import cv2
import numpy as np

# Callback Function for Trackbar (but do not any work)
def nothing(*arg):
    pass

# Code here
def SimpleTrackbar(Image, WindowName):
# Generate trackbar Window Name
TrackbarName = WindowName + "Trackbar"

# Make Window and Trackbar
cv2.namedWindow(WindowName)
cv2.createTrackbar(TrackbarName, WindowName, 0, 255, nothing)

# Allocate destination image
Threshold = np.zeros(Image.shape, np.uint8)

# Loop for get trackbar pos and process it
while True:
# Get position in trackbar
TrackbarPos = cv2.getTrackbarPos(TrackbarName, WindowName)
# Apply threshold
cv2.threshold(Image, TrackbarPos, 255, cv2.THRESH_BINARY, Threshold)
# Show in window
cv2.imshow(WindowName, Threshold)

# If you press "ESC", it will return value
ch = cv2.waitKey(5)
if ch == 27:
   break

 cv2.destroyAllWindows()
return Threshold

# in IDE

# Result