Optional overlay streams possible?

[StarTraveller]

Hi all, I hope you can help me answer a presumably basic question that I've been unable to find an answer for when searching.

I have started doing screen captures for various demonstration purposes. I would like to enhance them with annotations (notes, arrows, boxes, scribbles, doodles, etc.) to highlight particular points (or correct minor mistakes) and I would like to do so after having completed the recording. I would also like to keep these notes separate from the original video stream, i.e. I don't want to merge the overlay permanently onto the video stream. Ideally, I would include multiple overlays in various languages and the viewer could choose which overlay to view - or none at all (similar to how subtitles work).

Is the above possible? And if so, what tools and formats support it?

Thanks in advance!

[Krispy Kritter]

Whenever I've seen this done, it was permanent, not user selectable.

[JVRaines]

Search the web for "video annotation." Here's a product for $20.

[gdx]

Actually you have replied your one question without knowing it, and the solution is subtitles, in concrete ass subtitles. The best tool to do it is aegisub/assdraw, it can be a litle complicated for a new user and for some things can be needed a suport tool. After the subtitle is created you only ned to create a mkv with the files.