ball.py

import cv2
import numpy as np
def nothing(a):
    pass
cap = cv2.VideoCapture('youth.mp4') # video input 
cv2.namedWindow('black') # create new window 
img = cv2.imread('screen.jpg',1) # image input 
dim = (500, 500) # choose dimensions 
img = cv2.resize(img, dim) # create trackbar 
#trackbar for low values 
cv2.createTrackbar('RL','black',0,255,nothing)
cv2.createTrackbar('GL','black',0,255,nothing)
cv2.createTrackbar('BL','black',0,255,nothing)
#trackbar for high values 
cv2.createTrackbar('RH','black',0,255,nothing)
cv2.createTrackbar('GH','black',0,255,nothing)
cv2.createTrackbar('BH','black',0,255,nothing)

while(cap.isOpened()):
    ret, frame = cap.read() # read each video's frame 

    hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
    # get trackbar values
    rl = cv2.getTrackbarPos('RL','black')  
    gl = cv2.getTrackbarPos('GL','black')
    bl = cv2.getTrackbarPos('BL','black')
    
    rh = cv2.getTrackbarPos('RH','black')
    gh = cv2.getTrackbarPos('GH','black')
    bh = cv2.getTrackbarPos('BH','black')
    
    low = (rl, gl, bl)
    high = (rh, gh, bh)
    mask = cv2.inRange(hsv,low,high) # apply values in our mask 
    
    cv2.imshow('black',mask)
    cv2.imshow('image',img)
    #cv2.imshow('frame',frame)
    if cv2.waitKey(33) & 0xFF == 27:
        break

cap.release()
cv2.destroyAllWindows()