RishabhMalviya75/Rasenshuriken-and-chidori ? reverse-engineered prompt

Build me a simple browser based hand tracking app that uses the webcam to let me trigger anime style effects with my hands.

When I hold up my left hand with an open palm, it should activate a Naruto style Rasenshuriken effect, and when I hold up my right hand with an open palm, it should activate a Sasuke style Chidori effect. The app should detect up to two hands in real time, build up power while the hand stays open, and then play a smooth animated video overlay when the gesture is recognized. Add a dark cinematic background so the effects look good on top of the camera feed.

Keep it simple, no backend, no install, just open the page in the browser and allow camera access. Use plain HTML, CSS, and JavaScript, and if needed use current docs online for the hand tracking part. Make it feel polished and responsive, with the effect only showing when the right hand gesture is detected.