I was thinking of building whatever scene (or scenes) that you may want to follow your video, make them as simple or complicated as you need.
Then also create a scene, call it Target_Scene, add those other pre-made scenes to it, and set them all to "hidden".
I didn't realize you could add scenes to scenes, but sure enough, there's the option in the list of sources.
Does hiding it also kill any live audio sources and media playback? I've only used it for optional text overlays. While the audio concern should be obvious, the playback could also be significant on lesser systems.