The Twilio Programmable Video API is used to create a robust video chat application, and in this tutorial, the dominant speaker detection feature is added to it. The dominant speaker detection feature highlights the loudest participant in a call with multiple participants. To run the application, Python 3.6 or newer, a free or paid Twilio account, and a compatible web browser are required. The application uses vanilla JavaScript, HTML, CSS, and Flask as its backend framework. The tutorial provides step-by-step instructions on how to set up the Twilio account, install the necessary dependencies, and run the application. The updated index.html file includes a form for participants to join the video call and a div element to display the participants' name tags. The participantConnected function is used to create a unique ID for each participant's name tag. The connect function is modified to capture and handle dominant speaker change events from Twilio Group Rooms with 2 or more participants. The handleSpeakerChange function is called every time a dominant speaker changes, and it removes the highlight from the previous speaker and adds it to the current dominant speaker. The setLabelColor function is used to set the background-color of a label element.