[Python] OpenCV AttributeError module 'cv2.cv2' has no attribute 'Tracker_create'

I have tried to run this code but get an Attribute Error. Any help would be greatly appreciated.

import cv2
import sys

(major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')

if __name__ == '__main__':

# Set up tracker.
# Instead of MIL, you can also use

tracker_types = ['BOOSTING', 'MIL','KCF', 'TLD', 'MEDIANFLOW', 'CSRT', 'MOSSE']
tracker_type = tracker_types[5]

if int(minor_ver) < 3:
tracker = cv2.cv2.Tracker_create(tracker_type)
else:
if tracker_type == 'BOOSTING':
tracker = cv2.TrackerBoosting_create()
if tracker_type == 'MIL':
tracker = cv2.TrackerMIL_create()
if tracker_type == 'KCF':
tracker = cv2.TrackerKCF_create()
if tracker_type == 'TLD':
tracker = cv2.TrackerTLD_create()
if tracker_type == 'MEDIANFLOW':
tracker = cv2.TrackerMedianFlow_create()
if tracker_type == 'CSRT':
tracker = cv2.TrackerCSRT_create()
if tracker_type == 'MOSSE':
tracker = cv2.TrackerMOSSE_create()

# Read video
video = cv2.VideoCapture("./videos/chaplin.mp4")

# Exit if video not opened.
if not video.isOpened():
print("Could not open video")
sys.exit()

# Read first frame.
ok, frame = video.read()
if not ok:
print('Cannot read video file')
sys.exit()

# Define an initial bounding box
bbox = (287, 23, 86, 320)

# Uncomment the line below to select a different bounding box
bbox = cv2.selectROI(frame, False)

# Initialize tracker with first frame and bounding box
ok = tracker.init(frame, bbox)

while True:
# Read a new frame
ok, frame = video.read()
if not ok:
break

# Start timer
timer = cv2.getTickCount()

# Update tracker
ok, bbox = tracker.update(frame)

# Calculate Frames per second (FPS)
fps = cv2.getTickFrequency() / (cv2.getTickCount() - timer);

# Draw bounding box
if ok:
# Tracking success
p1 = (int(bbox[0]), int(bbox[1]))
p2 = (int(bbox[0] + bbox[2]), int(bbox[1] + bbox[3]))
cv2.rectangle(frame, p1, p2, (255,0,0), 2, 1)
else :
# Tracking failure
cv2.putText(frame, "Tracking failure detected", (100,80), cv2.FONT_HERSHEY_SIMPLEX, 0.75,(0,0,255),2)

# Display tracker type on frame
cv2.putText(frame, tracker_type + " Tracker", (100,20), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50),2);

# Display FPS on frame
cv2.putText(frame, "FPS : " + str(int(fps)), (100,50), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50), 2);

# Display result
cv2.imshow("Tracking", frame)

# Exit if ESC pressed
k = cv2.waitKey(1) & 0xff
if k == 27 : break


Output:

Traceback (most recent call last):
File "C:\Users\Jatin\OpenCV-Object-Tracking\index.py", line 15, in <module>
tracker = cv2.cv2.Tracker_create(tracker_type)
AttributeError: module 'cv2.cv2' has no attribute 'Tracker_create'

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