The author Naomi Pentrel created a free dog camera using Twilio Video, a service that allows for real-time video communication. The application uses Python 3.x, Flask, and ngrok to connect devices to each other and share video feeds. It includes features such as responsive UI with optimal screen real estate usage, changing the camera input on mobile devices, and muting/unmuting participants. The author shares their code and provides step-by-step instructions for setting up the application, including creating a Twilio account, installing dependencies, and configuring the Flask server. The final result is an interactive dog camera that can be accessed through a web browser, allowing users to view live video feeds from multiple devices.