I have no idea if its free, expensive, hard, easy, good or bad, just passing it on as a possibility
Pixcap - Easy Animation Software - Basic Intro
Just watched the video. It is free and can use youtube videos for video capture and is for 3d. But I think the video capture has a credit / payment system for rendering but u get some free credits monthly.
yeh I tested it briefly, results were fairly jank even on their example video. I'll stick to Mixamo / Blenderhell for the time being but keeping my eye on this (tis the future no doubt)
This was posted in another thread, but I think makes sense here.