Hi Muthu,
During runtime, did you debug and check if your router object has the new route in the correct hierarchy? Also, like the document mentions, you'll be adding the newView.view.xml and newView.controller.js in the extension project. Since this is in a different path than the views in the base project, you'll have to specify the viewPath specifically (viewPath will be the path in the extension project where newView.view.xml exists). Please see the attachment.
Thanks and best regards,
Shilpa