This tutorial guides developers through the process of upgrading a video chat application from Twilio to Zoom using Svelte and Go. The previous application used Twilio Video, which is being discontinued with End of Life (EOL) expected on December 5, 2024. Current customers are advised to migrate to Zoom Video SDK. The upgrade process involves updating the environment variables, replacing Twilio credentials with Zoom credentials, and generating a JWT for Zoom's Video SDK. Additionally, the frontend code is updated to use the Zoom Video Toolkit instead of the twilio-video package. After completing these steps, developers can test the upgraded application in their browser.