Get URL path or node.id in views fields replacement pattern
But if I click on Add field (in my view), nid, or path are not
  available?


Did you create a view of Show: Content ? (re-using pic from other answer, look in view settings)

You probably selected something else, hence why those fields are not available.

So you could add a relationship of node content or create a brand new view again and this time make sure you select Show: content.