/usr/lib/unicap2/cpi/libv4l.so is in libunicap2-dev 0.9.5-1.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/unicap2/cpi/libv4l.so.0.0.0
/usr/lib/unicap2/cpi/libv4l.so.0.0.0