The 'Scenes' feature is one of my favorite videos features of the iPhone X that works for the front-facing camera. It uses the TrueDepth camera system that can identify the person in the scene and replace the background with a completely new scene, as well as stylize the entire video at the same time. You get to see the changes in real-time and have the ability to record a video out of it.
This is kind of an advanced filter system. However, the great thing about it is that the virtual scene is a three-dimensional one, so when you rotate the phone around the subject, you get to see the scene in a different angle. This works for the front-facing camera where the TrueDepth camera resides, at the the of the screen where the notch is.
Users can easily swipe from scene to scene in real-time. This is one of the most unique video recording features that I've seen in quite a long time. I haven't heard about it in the Keynote event when the iPhone X was launched. I first saw it in a video by 9to5Mac.
Here, check out that video, but skip to minute 8:05 to start seeing that "Scene" video mode in action.
An amazing feature isn't it. This feature is not available anywhere else. The reason for that is that the phone needs those additional sensors to create that effect. This is great for selfie enthusiasts but everyone who want to impress his friends with more creative videos. I'm sure that Apple will add more and more cool scenes in the future so you'll have more stuff to play with.