Multicam Pro allows you to record two streams at once, as well as switch cameras without stopping the recording.
REQUIREMENTS Only iPhone's with an A12 processor (released in 2018) or above support multiple streams. However, older iPhones can still take advantage of switching the cameras without stopping the recording.
HOW TO USE Select the cameras you'd like to use by tapping on the switch icon and the 2nd camera feed. Tap the record icon to start recording. Note: You can also switch cameras during a recording.