Most document cameras come with their own stand. I have an IPEVO VZ-R [1], which you can route through your capture card with an HDMI switch if you already have that kind of setup. Being able to draw on a piece of paper to explain a concept feels amazing compared to whatever drawing tools one otherwise would have in software.
It's on a springy swing arm from a decapitated lamp. Googling for "camera swing arm" brings up a few images and products that look better than my hackjob.
[1]: https://www.ipevo.com/products/vz-r