There is the avermedia bu113 card, around 100 euros, works on everything from Windows pc, to ipad and of course linux without any additional drivers as it supports with UVC, downside, you basically need a hdmi splitter if you want to see something as its build to use big cameras as webcam
There is the avermedia bu113 card, around 100 euros, works on everything from Windows pc, to ipad and of course linux without any additional drivers as it supports with UVC, downside, you basically need a hdmi splitter if you want to see something as its build to use big cameras as webcam