How to configure live tracking in magento 2 CE?
"Live tracking" is available in Magento 1.x and 2.x by way of the transactional email. When adding a tracking number to a shipment the email that follows contains a link to the shipping module Tracking Popup action. This loads the popup.
To call this "live tracking" is a bit of a misnomer but if you utilize the API of a shipment provider like UPS or Fedex you will likely be able to click through to the tracking page for that API.
You have 2 options:
Utilize the API of the carrier, if the carrier offers an API and your carrier module supports it. In that case you need to have an active account with specific permissions to each carrier to use their API. Usually your carrier module asks for API credentials in it's configuration settings.
Use a module which consumes a tracking API, which supports several carriers. For example: ShipTracker