I've seen this on some recorded runs where it shows what keyboard and mouse buttons are being pressed. There's some unused space on my recordings and I think that would a great thing to add. How can I accomplish this myself? Here's hoping it's not too complicated.

Here's an example of what I'm talking about:

I just tried to record a run of Titanic: Adventure Out Of Time, which plays in full screen only so I cannot see the Livesplit timer when playing. However, it recorded it all wrong. It captured only the game audio and the Livesplit timer (which I've placed in the top-right corner) didn't budge at all until I closed the game, though it was definitely still running in the background. Hope all that made sense.

What can I do to fix this?

I've been into speed running for a while but never joined this site. So, well, I'm here now.