Hey folks,
We're aware of an issue where the latest NVIDIA graphics driver (591.74) is causing functionality loss with the in-engine video capture. We are working on a fix to this ASAP. In the meantime, if you rely on this feature, you can:
-Refrain from updating your drivers if you haven't already
-Attempt to rollback to an earlier driver version
-Use the VP9 Codec if you have a beefy machine
Feel free to use this thread to discuss alternatives/workarounds or report similar issues as we work on a fix.