[Question] Using Computer-vision in-browser examples

I am new to computer vision but am embarking on a new project. I would like to use a reference object for scale (like a wallet card) to then take measurements of multiple parts of wrist and hand, all implemented into a webapp.

Does anyone know of any tutorials, or similar projects?

Also, what is the best approach for this? Is it to take the image(s), send to the server, process using python (OpenCV) and then spit back the information? …

browser computer computervision examples vision