Color invert filter

This is a simplified version of our custom camera with a simple preview that only supports landscape left. The goal is to update SampleBufferTransformer to invert the colors.

Original

Goal

Requirements

• Implementation with Swift
• Create a repo with code provided
  • Create a PR with the changes you made
  • Briefly explain your approach and possible improvements if you had more time
• Can ignore all error handling by using fatalError()
• Feel free to ask any questions or tips if there's something unclear