Multitrack video export in OBS Studio
I have been looking for the same answer and found a thread in the OBS forum.

OBS does not support multitrack video support yet. The thread contains two workarounds:

Run two instances of OBS simultaneously

Directlink to post in thread


Open OBS Studio.
Sitting > hotkeys > Gave Start recording and Stop recording nice Hotkey (I use Ctrl+Shift+S and Ctrl+Shift+D)
Close then Open OBS Studio.
Open OBS Studio Again (Now you have 2 OBS Studio)
in the first OBS Go to sitting > Output > Recording > Select recording path
in the 2nd OBS Go to sitting > Output > Recording > Select recording path "Gave it another name"
Ex : Rec\FaceCame and Rec\GamePlay
Start the game and press Ctrl+Shift+S or the hotkey you pick


Drawbacks: A lot of manual steps to execute.

Increase the canvas size, place multiple videos side by side on it and split it in a video software afterwards

Directlink to post in thread

Drawbacks: No usable video output during recording.