S23 Series front and rear camera recording used at the same time

Using the front and rear cameras simultaneously allows for capturing the subject and the person taking the photo, enabling unique creative possibilities. However, not all devices support this, and the quality may vary depending on the device and result in increased battery consumption and slower processing times.

Shoot videos using the rear camera, and also shoot the reaction of the person shooting it at the same time using the front camera. This is also provided by several manufacturers/third party apps/social media. 

• Instagram also recently started offering a “Dual” feature for Reels.

https://about.instagram.com/blog/announcements/introducing-new-ways-to-collaborate-and-create-with-reels