Hello OBS community!
With OBS being updated to version 0.9.1, I felt like I needed to revise my previous stream setup/tutorial for Mac w/ Elgato & OBS (version 0.6.1).
You could find the link to the video here -
https://www.youtube.com/watch?v=deCiSmpUGes
I include three ways to capture your Elgato input via both Window Capture & Display Capture with or without facecam. As @dodgepong mentioned, a fourth way of capturing the Elgato input is via EyeTV and using a syphon source. In this case, you have one extra step, which would by syncing your live commentary with the video input.
Anyways, I hope this helps many of you - I tried to keep it succinct and to the point, so I don't explore some of the advanced features, but instead focus on getting your stream up and running as quick as possible (under 10 minutes).
Enjoy! :)