This repo GitHub - hselasky/webcamd: Linux USB kernel drivers in userspace daemon contains USB web cam drivers into userspace on FreeBSD.I don’t know if it can get ported to Haiku. Have a look
You can compile and use this addon:
/boot/home/config/non-packaged/add-ons/media
Haiku has UVC webcams drivers, but has issues with USB stack.
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