/usr/lib/x86_64-linux-gnu/libwebcam.so is in libwebcam0-dev 0.2.4-1.1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libwebcam.so.0
/usr/lib/x86_64-linux-gnu/libwebcam.so.0