The DoubleTake app can record two 1080p recordings at once at 24, 25 or 30 frames per second. The video recordings can't be digitally zoomed, and the extra features are pretty pared down. But the recordings can be simultaneously stored separately, or combined in a split view or picture-in-picture recording. Think a Twitch-like narration of an experiential tour somewhere seen through the rear camera as you talk to the front camera, or a two-person interview set up talking to rear and front cameras at once.
Sidd