Direct streaming from camera

[j-i-l]

Currently ffmpeg is used to stream from RTSP and save the stream to a file.

If we wanted to get a 'live' stream of a camera in the web-interface on Hera then the corresponding Argus node could stream to a HTTP server that then can be picked up by Hera.

This could easily be integrated with Argus' application server with https://github.com/kkroening/ffmpeg-python