I want to put together a small proof-of-concept augmented-reality filter that lives inside its own mobile app, not a social-media platform. The core of the experience is motion detection: the effect should react to full-body movement (for instance, when the user raises an arm or takes a step, a visual or particle effect appears). I am happy for you to choose the most efficient toolset—Unity with AR Foundation, ARKit/ARCore directly, or any comparable SDK—so long as it gives reliable body-tracking and runs smoothly on current iOS and Android devices. Deliverables • Source project with all assets and code • A compiled demo build (APK + iOS build folder) showing the body-movement trigger in action • Brief setup notes so I can open, edit, and re-export the project on my own machine Acceptance criteria: the demo must recognise body movement consistently in normal indoor lighting and render the chosen visual effect without noticeable lag.