A developer created a live video webinar application using AdonisJs and Twilio Video. The application allows hosts to create and manage rooms for guests to join, while also enabling host-to-host video communication. The system uses WebRTC to establish real-time connections between participants. The application includes features such as token-based authentication, room creation, participant connection/disconnection events, and basic video playback. The developer provides a step-by-step guide on how to set up the application using AdonisJs CLI, Twilio Video SDK, and JavaScript. The application can be extended with additional features such as user accounts, Q&A, or chat functionality.