text: import cv2
  import cvui
  username = "admin"
  password = "password"
  width = 640
  height = 480
  cam_no = 1
  def create_camera (channel):
      rtsp = "http://" + username + ":" + password + "@192.168.10.30/cgi/mjpg/mjpg.cgi"
      cap = cv2.VideoCapture()
      cap.open(rtsp)
      cap.set(3, 640)  # ID number for width is 3
      cap.set(4, 480)  # ID number for height is 480
      cap.set(10, 100)  # ID number for brightness is 10qq
      return cap
  cam = create_camera(str(cam_no))
  cvui.init('screen')
  while True:
      success, current_cam = cam.read()
      dim = (width, height)
      Full_frame = cv2.resize(current_cam, dim, interpolation=cv2.INTER_AREA)
      cv2.namedWindow('screen', cv2.WINDOW_NORMAL)
      cv2.setWindowProperty('screen', cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
      if (cvui.button(Full_frame, width - 100, height - 40, "Next") and cvui.mouse(cvui.CLICK)):
          print("Next Button Pressed")
          cvui.init('screen')
          cam_no = cam_no+1
          if (cam_no>4):
              cam_no=1
          del cam
          cam = create_camera(str(cam_no))
      if (cvui.button(Full_frame, width - 200, height - 40, "Previous") and cvui.mouse(cvui.CLICK)):
          print("Previous Button Pressed")
          cvui.init('screen')
          cam_no = cam_no - 1
          if (cam_no<1):
              cam_no=4
          del cam
          cam = create_camera(str(cam_no))
      cv2.imshow('screen', Full_frame)
      if cv2.waitKey(1) & 0xFF == ord('q'):
          cv2.destroyAllWindows()
          break
  