ovis, aruco_ar_demo, remove trailing whitespace

Add missing codecs to cudacodec which uses Nvidia Video Codec SDK including checks to ensure codec used in input video file is supported on the current device.
Re-enable cudacodec performance test.

* doc: fix return parameter for void method

* docs: add missing parameter description

KinectFusion: several updates (#2133)

* truncateThreshold added

* demo updated for RealSense

* first Kinect2, then RealSense

* more distance-based parameters

original commit: https://github.com/opencv/opencv/commit/5c56b8ce9251050a4aadb9570ee598aaa14a2cf4

* added detection of inverted Markers, tests included

* corrections added, default preserved, identation, var, comment

Move background subtraction python tutorial to proper location (#2120)

* add tutorial from OpenCV-Python Tutorials

* remove trailing whitespace

* remove MOG2 part

* add cross-link to MOG2 tutorial

Incomplete sentence corrected. Resolves Issue #1997 (#2000)

* Incomplete sentence corrected. Issue #1997 

Resolves Issue #1997

``` FaceRecognizer::train(InputArrayOfArrays src, InputArray labels); ```

The type `InputArray` can accept `vector<T>` or `Mat` types as mentioned here: https://docs.opencv.org/3.4/d4/d32/classcv_1_1__InputArray.html

* Trailing whitespaces problem resolved

* Simplified quality API

* Compilation fixes

* test fixes

* Test updates

* Test fixes

* Fixed brisque data file location for install, test

* Increase error epsilon to account for multiple architectures

KinFu: try to fix OCL fails (#2106)

* some TODOs closed

* temporary turn on NaNs patching

* reverted

* temporary debug code added

* more debug code

* inf check; more debug code

* debug code in kernel

* debug code, try to disable some optimizations

* -cl-fast-relaxed-math option removed, debug code removed

reverts CUDA related stuff of commit ff0167b9