A simple app that grabs raw camera data, converts to textures and renders on screen using Metal.
The app uses two reusable components with (hopefully!) simple and straightforward interfaces: MetalCameraSession and MTKViewController.
MetalCameraSession helps you grab raw camera data as pixel buffers with either of two pixel formats and convert it to a Metal texture (or textures). You can choose either of two pixel formats: RGB or YCbCr, RGB being a default option, since it produces a single texture that can be drawn on screen right away. YCbCr would be a better choice in some cases though, since it is a hardware native format, hence works faster and produces textures of smaller size.
MTKViewController is a UIViewController subclass containing a MTKView that renders an arbitrary texture on screen with the help of a couple of small Metal shaders.