Python OpenCV – Live camera stream with mouse click interaction

import numpy as np
import cv2

#Create the circle
colour = (0,255,0)
lineWidth = 3       #-1 will result in filled circle
radius = 30
point = (0,0)

#function for detecting left mouse click
def click(event, x,y, flags, param):
    global point, pressed
    if event == cv2.EVENT_LBUTTONDOWN:
        print("Pressed", x,y)
        point = (x,y)
        
#event handler
cv2.namedWindow("Frame")      #must match the imshow 1st argument
cv2.setMouseCallback("Frame", click)
    


cap = cv2.VideoCapture(0)

#Loop for video stream
while (True):
    
    stream = cv2.waitKey(1)   #Load video every 1ms and to detect user entered key
    
    #Read from videoCapture stream and display
    ret,frame = cap.read()
    cv2.circle(frame, point,radius,colour,lineWidth)     #circle properties as arguments
    frame = cv2.resize(frame, (0,0), fx=0.5, fy=0.5)  #this fx,fy value will be explained in post
    cv2.imshow("Frame", frame)
    
    if stream & 0XFF == ord('q'):  #If statement to stop loop,Letter 'q' is the escape key
        break                      #get out of loop
        
cap.release()
cv2.destroyAllWindows()