HD screenshot and HD video

I was wondering, since to have very detail screenshots from a scene is much better to use NVIDIA Ansel than the HD resolution screenshot from Unreal.

Is there a way to get 8k - super good quality videos with an external source-plugin instead of using ue4 (since the quality is not that great)??

I guess there must be a way since twinmotion does produce quality videos using ue4 engine…