* Support 3D ResNet-34-kinetics

* Update sample

* Remove preprocess

* Change test

* Fix sample

backporting of commit: 419a6d51

Merge two Haar Cascade tutorials (#14674)

* move haar cascade introduction, add code explanation, mark content as moved

* switch to ref for include to provide correct breadcrumb navigation

VideoCapture Direct Show. Added getter for CV_CAP_PROP_CONVERT_RGB, CAP_PROP_CHANNEL properties. (#14592)

* Added getter for CV_CAP_PROP_CONVERT_RGB, CAP_PROP_CHANNEL properties.
Some refactoring.

* One space less.

Fix dnn visualizer (#14537)

* Fixed print layer params

* Fix print

* java: fix java missing_consts

* java: test Calib3d constants

Usage example:
- run.py -a -t java --package=calib3d

HSV and HLS color conversions rewritten to wide intrinsics (#14616)

* RGB2HSV_b vectorized

* RGB2HSV_f: widen

* RGB2HSV_f: shorten, more intuitive

* HSV2RGB_f and HSV2RGB_b widen

* hls2rgb_f widen

* instrumentation instead vx_cleanup

* RGB2HLS_f widen

* RGB2HLS_b rewritten to wide universal intrinsics

* define guard against no SIMD code

* hls2rgb_b rewritten

* extra define removed

* warning fixed

* hls2rgb_b: performance fixed