If any one here uses quicktime on the mac to record the output of an ios device, or just to record something, you might have noticed, that there is an option to stop the recording, but not an option to pause it. As a matter of fact, the recording can be paused. Here's how.
So, when you are recording something, and you want to pause the recording, hold down the option key. If The vo cursor is over the stop recording button, after you hold down the option key, this button will change into pause recording. Now, while continuing to hold down the option key, press space. The recording will be paused. The button will now say, resume recording. Just press it to continue with your recording.