Use EasyTello + OpenCV to obtain the video stream from Tello

cam.py

from easytello import tello
import time
import cv2

# see: https://stackoveflow.com/questions/50916903

d = tello.Tello()
d.takeoff()

d.streamon()

time.sleep(3) # you might not need this

cap = cv2.VideoCapture('udp://0.0.0.0:11111')
if not cap.isOpened():
  print("Failed to open VideoCapture, stopping.")
  exit(-1)

while True:
  ret, frame = cap.read()

  if not ret:
    print('empty frame')
    break 

  cv2.imshow('image', frame)
  if cv2.waitKey(1) & 0xFF == ord('q'): # push Q to close
    break

d.land()
d.streamoff()

cap.release()
cv2.destroyAllWindows()