How should I go about creating a custom raw video output with streaming to twitch as the endpoint?

[lunavod]

I'm writing a plugin, with the idea of creating a plugin that modifies frames before sending them to twitch.
I found how to create a custom output that takes raw frames and modifies them. I also found that I should be able to connect it to twitch using services.
However, I found very little info on services and how to use them, so I would appreciate any info or examples on that.