I'm sorry no one has answered you yet. For some reason there are slower responses here than on other model drone forums. Did you find your answer? Can you elaborate on what you are actually seeking? I think you'll find those options in the Tello app.
I'm seeking for the intrinsic parameters of the camera in tello, particularly on the focal length (fx, fy), optical centre (cx,cy) and distortion parameters. Has anyone here had any clue how to obtain these parameters ?