Open Audio MIDI Setup (Applications > Utilities), and create a Multi-Output Device, adding the headset with Built-in Output. To listen through the headset while you screen record, there are a few more steps. Open System Preferences, set the Sound Output to USB, and Input to the Microphone port. And the other end of the audio cable into the microphone. 
Plug the audio cable into the computer. This works even if you only have one audio port on your computer. To screen record WITH internal audio AND microphone voice over using QuickTime on a Mac (without downloading additional software) you will need a USB microphone and a Bluetooth headset + mic'd audio cable. Is the "theme" you're referring to the sound of the mic picking up the audio from the speakers? This is avoidable, and you shouldn't need to download any additional software all that's required is QuickTime, System Preferences, and Audio MIDI Setup (Applications > Utilities > Audio MIDI Setup, for the Multi-Output + Bluetooth headset). Say for example, you want to record video either from the camera or the screen and you want to sound to be music from iTunes, then you will to feed the sound from the output jack back into the input jack. If you are trying to make a recording where the sound is being produced by the computer, then you need to plug a jumper into the input and output jacks. If you are using the built-in mic or an external microphone and the internal or some other external speakers, then the System Preferences output volume and/or the Quick time level should set to zero.Īlthough not directly asked in our question, I might as well add the following: 
This is not the same level as the output volume shown in System Preferences. This is the level used monitor what is being recorded.
The third auto level is set in QuickTime, as shown below. The output volume controls level for the internal speakers other device (such as headphone) you may plug into the output jack. The input volume is the record level from either the built-in mic or input jack. The first two can be set from System Preferences, as shown below. There are three different auto levels involved with a recording.
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