This blog by Prakhar Soni demonstrates how to integrate Agora Video SDK 4.x with a React application to enable group video calling feature. The author provides a step-by-step guide on creating a bare-bones React application and integrating the SDK, along with an overview of the front-end architecture and application architecture. The tutorial also includes information about signing up with Agora, prerequisites, and additional resources for further features. The code base for this tutorial is available on GitHub.