The Atem can definitely do this. There are youtube tutorials on it. You use one of the many apps that can output your text, set it to output the background as

The Atem can definitely do this. There are youtube tutorials on it. You use one of the many apps that can output your text, set it to output the background as green or whatever. Then you can use the Atem to do one video stream inside the other, picture in picture, you can customize the size of the picture in the picture. You can also have ot chroma key out the green (or whatever) from the text app, so it will only display the text, and the background will be the main video stream. Bam.