Most established streamers have some sort of overlay system. They can be a lot of fun to play with. You’ll put them in your video with your streaming software, as image, window, or browser sources. For automatic pop up notifications, you will need a third party chat bot or donation service that offers an overlay. Keep in mind that the more you put on screen, the harder it will be for the viewers to notice what’s important!
Overlays when streaming from Xbox One or Windows 10 Game bar:
Do you stream from Xbox One or Windows 10 game bar and want to setup an overlay? Please see here on how to do so with Lightstream.