Extend AEM Core Component Embed!

I would like to extend the embed core component to add url processors including vimeo. I proxied the core component to under apps, added an htl template naming vimeo.html under processors. Have also wrote the java class for the processing, which is created under  com.project-name.core.components.embed. I'm not sure whether it's the right location to add the java file, and how will it map to this. Could someone help me with extending and adding a custom url processor. Went through the examples on git regarding pinterest, but for project specific how to do that!