How do I add plugin to Janus?

[The Sun]

I have problems with CORS policies on my Janus server when I try to connect from a domain. I have Janus running on port 8089 via https and I use nginx reverse proxy to access it. I also run this airsista.cf web-app on port 9998 also through nginx. 

The error: 

https://ctrlv.link/HExW

I have found out that there is a CORS plugin to Janus and I have found this on their docs on github: https://github.com/motiv-labs/janus/blob/master/docs/plugins/cors.md

the problem is that I dont know how to add it to Janus and thought that someone here might help me. Here is a documentation about Plugins on janus: https://github.com/motiv-labs/janus/blob/master/docs/plugins/README.md

Someone please help me.