During my time at PlanView, I created three CD demos, the first the company ever had, plus I did the first PlanView computer-based training module. Now there's a large documentation department at PlanView handling this and more! I usually wrote the script, the dialog, and provided incidental art. Then I would work with a multi-media firm to put it all together.
At CSC, most of our videos were overviews or branding videos. We would create 3-5-minute versions, then have a 30-second "hotspot" that we would post to YouTube and social media. I helped brainstorm, write and choose graphics for those.