Here's a look at the new Epiphan Video AV.iO 4K HDMI to USB Adapter that takes the Video Output from your cameras and allows you to input them to your Laptop or Computer. They also offer many other to capture video feeds from SD-SDI, HD-SDI, DVI, VGA, and more! These new adapters can input up to 4K Resolutions for which you can Capture, Record, or Stream.
Once you have your camera's Video Feed on your system you can choose to Record or Stream from your camera's video and audio directly to services such as Facebook Live, YouTube Live, and many other online services. This is a great way to use professional cameras and zoom lenses instead of using cheap webcams for your Live Stream. I use adapters like these to stream from my Multi Camera Live Switch Setup (seen here).
You can also take the feed from your cameras and use software like ScopeBox turning your Mac Laptop or iMac into professional a large screen Directors Monitor complete with Waveforms, Vectorscopes, RGB Parade, Histograms, Focus Peaking, Zebras, and more!
The Epiphan 4K Video AV.iO Adapters work over USB so no Thunderbolt ports needed (unlike some BlackMagic Design adapters), no drivers to install, and no software required for the adapter to be seen by many popular applications. There is also no configurations needed to set the proper resolution or framerate, most software such as just sees the device. Very Simple. Remember that this can take up to 4K resolutions (not just 1080).