Licensing: https://unrealsolutions.com/
Roadmap: https://docs.google.com/document/d/1EN-KGQoj6XTF2DsdeUTCL4PTeosyGVI2G52iUeMTJ4g/edit?usp=drive_link
UPD: Video Tutorial
Go to any Blueprint, grab reference to RuntimeVideoRecorder and call Start/Stop recording. You can provide desired width, height and fps if needed. Example:
How to use: Buy & download RuntimeVideoRecorder from website. If you are not satisfied with the product quality then ask for refund in Discord.
Additional information:
This repository also provides x264 and l-smash static libraries for popular platforms (Windows, Linux, Mac and Android). If you have corresponding license for x264 and willing to fully open-source your Unreal project code you can probably use x264. However, this is not a legal advice, ask experts.