Question / Help How this is done?

[Gridfull]

Just wondering how this replay has been done.

Link To video:
https://www.twitch.tv/drdisrespectlive/v/114186352

 

[H4ndy]

How is what done? Can't see anything out of the ordinary there...

 

[EBrito]

OBS Replay Buffer, page 76
https://obsproject.com/forum/resour...ware-studio-multiplatform-help-guide-pdf.365/