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This app lets you play around with OpenCV, like jsfiddle or codepen: https://cloudvision.app/

That's a... very misleading name. It's called "Cloud" vision, but then says:

> Cloud Vision does not track, record or send any images, videos, or information provided by the user to any server. All image processing is performed within the application.

Wow I am impressed at how smoothly it runs in the browser. Was not expecting it to reach 30fps, I thought WASM builds were still pretty unoptimized.

That's a much better demo, but depending on your webcam size, it'll overlap on the controls and block you from changing the filters.