Thanks @Nationalsolo but that's a very limited set and does not do what I need. For example, I want to be able to draw (or place) a line anywhere (as an overlay, I guess) and resize, rotate, change thickness, color, etc. These types of tools are available in free or cheap apps like Hudl Technique or Cache's Eye for mobile devices, but I was hoping to avoid going back and forth from recording device (e.g. phone or tablet), to VP and then back to Mobile for annotating, etc.
Thanks also @borate that is a good idea and I may look into that to see if it does what I need.