RTSP connection issue on IP Camera

I have flir blackfly s bfs-pge-04s2c-cs model ip camera. I have poe injector that is connected to router and to camera. I can find the camera ip. My problem is I cannot connect with rtsp.

with EasyPySpin I can get a frame with the code below.

import cv2
import EasyPySpin

cap = EasyPySpin.VideoCapture(0)
print(cap.get(0))

for i in range(100):
    ret, frame = cap.read()

cv2.imwrite("frame.png", frame)
    
cap.release()

I need rtsp connection for my other processes the ip is shown with the matched mac adress in my system. I tried like that

import cv2
import os

RTSP_URL = 'rtsp://192.168.1.240'

os.environ['OPENCV_FFMPEG_CAPTURE_OPTIONS'] = 'rtsp_transport;udp'

cap = cv2.VideoCapture(RTSP_URL, cv2.CAP_FFMPEG)

if not cap.isOpened():
    print('Cannot open RTSP stream')
    exit(-1)

while True:
    _, frame = cap.read()
    print('hehe')
    cv2.imshow('RTSP stream', frame)

    if cv2.waitKey(1) == 27:
        break

cap.release()
cv2.destroyAllWindows()

I cannot make a connection with this code.