Yes, you can add audio from a microphone to your video recordings. Follow the below steps to easily add these to your videos.
A.) Open Settings
Open OBS and then click Settings in the lower-right corner.
Select the Audio button from the left section
C.) Select your Microphone
Although each computer setup is slightly different, next to the Mic/Auxiliary Audio Device option, choose the option Default then click Ok.
D.) Confirm the audio meter shows
You should now see a new Mic/Aux input in the Mixer section of OBS. Make some noise/talk a little bit and you should see the audio bar shrink/grow to match the intensity/volume of the noise you’re making. It should look like the image here.
Note: If you do not see any movement when talking, return to step C and select a different microphone from this list. Also confirm that you can see the complete list of inputs with the scroll bar next to the Mixer section.