In this section, we will try to understand how to track a color in a video using OpenCV. The following is the code for tracking yellow color in a video:

import cv2
import numpy as np

def detect(img):

         lower_range = np.array([40,150,150], dtype = "uint8")
         upper_range = np.array([70,255,255], dtype = "uint8")

         img = cv2.inRange(img,lower_range,upper_range)
         cv2.imshow("Range",img)

         m=cv2.moments(img)
         if (m["m00"] != 0):
                  x = int(m["m10"]/m["m00"])
                  y = int(m["m01"]/m["m00"])
         else:
                  x = 0
                  y = 0

         return (x, y)


cam = cv2.VideoCapture(0)

last_x = 0
last_y = 0

while (cam.isOpened()):

         ret, frame = cam.read()

         cur_x, cur_y = detect(frame)

         cv2.line(frame,(cur_x,cur_y),(last_x,last_y),(0,0,200),5);
         last_x = cur_x
         last_y = cur_y        
         cv2.imshow('frame',frame)

         if cv2.waitKey(1...