Hi Dan,
setting the video title and obtaining details about the video can be done using the Vimeo API. tus-js-client is not a Vimeo API client and is only concerned about uploading files. Therefore, tus-js-client does not have any special options to set the video title and does not return any Vimeo API-specific information in the onSuccess callback. These things should be done with the Vimeo API. I haven’t used it for myself, so I cannot point you in any direction directly but please look at their documentation or contact their support for more help.