Thanks all for yours comments, sorry for the date that i'm responding, the program need to be on python. Can some one can give me an example of the -roi? I a newbie using raspberry, linux and python

Good Day Toda y was muy first Day using Raspberry 3 and the raspberry camera (8MP). I have a project that I will used the camera with 720 x 720 resolution, and that was easy, but I didn't find information on how can I do to make the video on circle shape... I need the video in a circle or 720p of di...