You can use Switcher Studio to record a video without livestreaming. For recording only, you will simply select None from the Outputs tab on your main switching device:
Navigate to the Outputs tab by tapping the icon that looks like a box with a right-facing arrow in the tab bar.
Under the Broadcasting section, scroll down to None.
Once you have selected None as the Output, you can record without streaming. Just tap the red circle in the top right corner to start and stop the recording.
Once you are finished recording, you can export the recording from the Switcher Studio app to your Photos app or computer. This article provides step-by-step instructions: Accessing & Exporting Video Files
You can also add past recordings into future productions as a video asset. Check out this article for more details information: Switcher Video as an Asset