import cv2
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
#### Loading HaarCascade Detector
#eyes_detect= cv2.CascadeClassifier('/Users/pk/Desktop/snapchat/frontalEyes.xml')
eyes_detect=cv2.CascadeClassifier(cv2.data.haarcascades + 'frontalEyes35x16.xml')
print(type(eyes_detect))
#nose_detect= cv2.CascadeClassifier('nose.xml')

#Loading images
im_mush= cv2.imread('/Users/pk/Desktop/snapchat/Train/mustache.png')
im_glasses= cv2.imread('/Users/pk/Desktop/snapchat/Train/glasses.png')
print('im_mush',im_mush.shape)
print('im_glasses',im_glasses.shape)

im_jamie_before=cv2.imread('/Users/pk/Desktop/snapchat/Train/Jamie_Before.jpg')

print('im_jaimie',im_jamie_before.shape)

eye=eyes_detect.detectMultiScale(im_jamie_before,1.3,5)

for e in eye:
    x_eyes,y_eyes,w_eyes,h_eyes=e
    cv2.rectangle(im_jamie_before,(x_eyes,y_eyes),(x_eyes+w_eyes,y_eyes+h_eyes),(0,255,255),2)

#cv2.rectangle(im_jamie_before,(x_eyes,y_eyes),(x_eyes+w_eyes,y_eyes+h_eyes),(0,255,255),2)

cv2.imshow('jaimie',im_jamie_before)
key_pressed=cv2.waitKey(0)
if key_pressed==ord('q'):
    cv2.destroyAllWindows()


Output-
Parikshits-MacBook-Pro:~ pk$ python3 /Users/pk/Desktop/snapchat/filter.py

<class 'cv2.CascadeClassifier'>
im_mush (320, 640, 3)
im_glasses (221, 483, 3)
im_jaimie (1024, 733, 3)
Traceback (most recent call last):
  File "/Users/pk/Desktop/snapchat/filter.py", line 21, in <module>
    eye=eyes_detect.detectMultiScale(im_jamie_before,1.3,5)
cv2.error: OpenCV(4.2.0) /Users/travis/build/skvark/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'detectMultiScale'