This is a paid asset, but now you can download AVPro Movie Capture (Windows) Free.
Detail this asset from Unity Store: Original Link
AVPro Movie Capture Windows v4.6.2 (Latest version)
The video capture Unity plugin solution for professionals
Webpage | Documentation | Forum
*DOWNLOAD THE FREE TRIAL VERSION HERE*
Other Packages: Full (macOS, iOS and Windows) | macOS only | iOS only | Windows only | Free trial
Features:
+ *NEW* System-wide audio capture (Windows only)
+ *NEW* Ambisonic capture to WAV
+ *NEW* Offline audio capture support
+ *NEW* Unity 2020 support
+ Very easy to use
+ Optimised for high performance
+ Simultaneous captures
+ Supports Unity 5.6+, 2017.x, 2018.x, 2019.x
+ Real-time capture and offline rendering
+ Rendering to 8K resolution
+ Works in the editor and also in standalone builds
+ 360 and 180 VR captures (mono and stereo
+ Omni-directional stereo (ODS) support for VR renders
+ Motion blur rendering
+ Linear and Gamma colour-spaces supported
+ Can capture alpha channel for creating transparent videos
+ Records audio directly from Unity or from a system recording device
Standalone Windows only.