This tutorial guides developers on how to create an immersive video chat app using Augmented Reality (AR) in Unity. The guide assumes that the reader has already created a basic video chat app, as demonstrated in a previous tutorial. To implement AR functionality, the Agora Video SDK for Unity3D is integrated into the project. Additionally, AR Foundation packages are installed on Unity Editor. The existing project is then modified to include an AR Camera and a sphere for positional reference. A script is also updated to generate cubes instead of planes when a new remote user joins the chat. Finally, the app is built for either iOS or Android, with configuration settings adjusted accordingly.