The tutorial teaches developers how to add a raise hand feature to their Twilio Video application using the DataTrack API, allowing participants to send low-latency messages to each other during calls. To start, developers need to set up a new project with Twilio and install necessary dependencies. They then update the HTML and CSS files to include a button for raising hands and add JavaScript code to handle the raise hand logic. The JavaScript code checks whether a hand is raised, raises or lowers it, and sends notifications over the data track to other participants on the call. Once tested, developers can deploy their application using the Twilio Serverless Toolkit and share a link with others to join the video call.