In this video, Mervin Praison demonstrates how to use parallel function calling in Node.js with GPT assistants. The tutorial covers integrating multiple software functions into GPT assistants to perform tasks such as fetching stock prices, performing currency conversions, and retrieving the latest news simultaneously. Mervin provides a step-by-step guide on setting up packages, defining functions, and implementing parallel execution in a Node.js application. The video begins with an introduction to parallel function calling and the benefits of integrating multiple functions. Mervin then explains how to add currency conversion and news retrieval functions to an existing application that already fetches stock prices. He details the installation of necessary packages (node-fetch, OpenAI, and Yahoo Finance) and the setup of API keys. The function definitions for fetching news and converting currencies are provided, along with their integration into the dispatch table for parallel execution. Mervin demonstrates running the code and observing the output, showing how the assistant retrieves and processes multiple data points concurrently. The video concludes with a call to action for viewers to like, share, and subscribe for more tutorials on AI and software development.