This should be safe todo unless we are writing a signal handler.

xioctl() assumes that ioctl takes int request. Cope with
  int ioctl(int d, unsigned long request, ...)
to avoid "invalid argument".

The video(4) driver provides a Video4Linux2 compatible API for
various video peripherals. This patch propagates HAVE_VIDEOIO if
the sys/videoio.h include file is found, which is the signature of
video(4).

- added CMake toolchain file
- added WITH_NVCUVID flag

Sometimes information about dependencies causing disabling were loosed and it
was not possible to correctly display these dependencies in status report

This suppresses "unused variable" CMake warning when user explicilty disables
module unavailable in selected configuration

remove as much warnings as possible
use enum instead of MACRO for ocl.hpp
add command line parser in accuracy test and perf test
some bug fix for arthim functions