The Vonage Video API provides a powerful tool for personalizing video streams by integrating transformers into the stream. The Media Processor API simplifies the use of the Insertable Streams API for transforming video and audio tracks, allowing developers to easily add features such as QR codes and watermarks to their video streams. By leveraging this API, developers can enhance their videos with interactive elements like QR codes that contain URLs or text, and watermarks that provide branding or copyright protection. The Vonage Video API offers a flexible and customizable solution for adding these features to video streams, making it easy for developers to create engaging and interactive video content.