v2: fix stray trailing whitespace

v3: only allow for up to one property window at the time

Opening multiple windows in the same process will just confuse
the camera filter or outright crash.

Suggested-by: @alalek

Also return whether a dialog was opened at the time.

* UMat blobs are wrapped

* Replace getUMat and getMat at OpenCLBackendWrapper

* Update to properly find the compiler tools for MSVC 2017

* FindCUDA: Fix the MSVC 2017 compiler tool locations

Signed-off-by: Li Peng <peng.li@intel.com>

Save video file (#10502)

replaces REUSE_DNN_MEMORY compile-time option

Bitwise "and false" is always false.

* Add a parameter labels to command line

* default value

* samples: caffe_googlenet.cpp minor refactoring