Hello!

Jitsi Videobridge it is just a component in other words it is a part of Jibri. So, it means that when you install Jibri for streaming and recording, Videobridge component is installed with it in the same time. It is something like middleware between Jitsi Meet and Jibri and allows to run many Jibri instances (in case if you have many Jibri instances) to run several video streaming and recordings in the same time.

Don need on install it specially or separately to your server or adds any special modifications to the Messengers, just install Jibri and you will have it.