Video showing issue
This seems to only happen in Overwatch. The game plays fine, but all video recordings are twitchy. I thought it was the client playing it wrong but even uploaded it seems to have the issue.
Definitely seems to be an encoding problem. Have you checked to see if any other recorders are running in the background?
I'm still having the problem and I've disabled all over recorders.I have other overlays such as steam, or Discord, but i have those in other games as well and this only seems to happen with Overwatch.
Different games can be affected differently. Steam Overlay is typically fine, but Discord overlay may cause issues. I'd also recommend making a support ticket with logs attached if you have not done that already.