How to add watermark to all images automatically with nginx?

I did a lot of searching on google, but I couldn't find the right content to work with.I have ubutnu 18 and nginx v. 1.18.0 and I want every uploaded image to be converted automatically and a watermark added.I tried this module but it doesn't work. https://github.com/intaro/nginx-image-filter-watermarkI have installed the Nginx-image-filter module, but with the nginx -t syntax for watermark it specifically says that such a thing does not exist and shows FAIL.