If you want to compile it yourself you can do so with
mvn clean package
This should create a zip in the target folder.
Just drop this zip file to the "plugins" folder of the KosmoS platform.
If you dont want to compile yourself you can always get the zip file from the latest releases page and drop it into the "plugins" folder of the KosmoS platform.
Open your KosmoS config file (config/config.json).
Find or add the "camera" block and change it to the correct settings.
{
[...]
"cameras":[
{
"password":"verysecure",
"name":"reolink-camera-1",
"base":"http://192.168.1.123/",
"username":"admin",
"clazz":"de.kosmos_lab.platform.plugins.camera.reolink.ReolinkCamera"
}
],
[...]
}