What is the difference between a video CMS and a regular CMS?

A regular content management system manages web pages and the text and images on them. A video content management system is built around video specifically — it transcodes files on ingest, streams them adaptively, indexes what is said and shown, controls playback permissions by role, and reports on who watched what. Most organizations run both, with the video CMS handling everything video-specific and embedding into the web CMS where needed.