Apple:

Clips, Apple’s easy-to-use video creation app for iPhone and iPad, gives users even more fun options to record captivating videos. With all-new AR Spaces powered by LiDAR on iPhone 12 Pro and iPad Pro models, creators can transform a space by adding immersive visual effects that map to the contours of a room, and can be easily shared with anyone.

And:

With AR Spaces in Clips 3.1, users can easily scan a room and see a live preview of effects that bring dynamic lighting, falling objects, and immersive scenes to life. Using the rear camera on a supported iPhone or iPad, users will see effects appear on walls, floors, surfaces, furniture, and objects.

This looks like a lot of fun. Depends on the LiDAR Scanner introduced on last year’s iPad Pro and found on the iPhone 12 Pro as well.