Magewell is a company that makes the components that connect video and audio output with the applicable software. Its latest M.2 video capture card is of its 'Eco' line-up, and is capable of single-channel operation at up to 4096x2160 at 60 frames per second over 12G-SDI. It will be launched in 2020 at the ISE exhibition.
https://www.notebookcheck.net/The-Magewell-Eco-Capture-SDI-4K-Plus-M-2-can-bring-high-res-video-to-the-PCIe-less-boards-of-the-future.447043.0.html