I am trying to make an nVidia Jetson Nano developer board work with a USB camera that seems to operate over a proprietary protocol, since OpenCV 4 can't interact with it like it can with a simple USB webcam. The docs to the camera I'm working with link to an SDK that is used to set up the camera, and comes with code examples of use of the camera. I installed this SDK, but it won't run due to lack of the libpng12.so.0 shared library file that, I believe, comes with the libpng12 package.
I did a lot of web searching, but failed to find libpng12 specifically for my setup: the board uses Ubuntu 18.04 LTS on an arm64 processor, but I could only find libpng12 for amd64 or and arm64 libpng12 library for 16.04. Does libpng12 for arm64-based Ubuntu 18.04 LTS exist, and if yes, how do I install it?