To implement a streamer for the opencv output You can use this link as a guide.

https://ariandy1.wordpress.com/2013/04/07/streaming-opencv-output-through-httpnetwork-with-mjpeg/

This link uses C based opencv script but it can also work with your python script. As long as the output is stored as a video file with the required format then image-magick will still stream it. ...