For updating docker blog

InstallScripts/docker/Dockerfile

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+FROM python:3.7-slim-buster
+
+MAINTAINER Labhesh Valechha <labheshvalechha@gmail.com>
+
+ARG opencv_version=4.4.0
+ARG pythonVersion=3.7
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+	apt-utils \
+	build-essential \
+	cmake \
+	git \
+	vim \
+	libgtk2.0-dev \
+	pkg-config \
+	libavcodec-dev \
+	libavformat-dev \
+	libswscale-dev \
+	libeigen3-dev \
+	libgflags-dev \
+	libgoogle-glog-dev \
+	libhdf5-dev \
+	&& pip install numpy \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV PYTHONPATH=/usr/local/lib/python"$pythonVersion"/
+ENV PYTHONHOME=/usr/local
+
+WORKDIR /home
+
+RUN git clone https://github.com/opencv/opencv_contrib.git \
+        && cd opencv_contrib \
+        && git checkout $opencv_version \
+        && cd .. \
+        && git clone https://github.com/opencv/opencv.git \
+        && cd opencv \
+        && git checkout $opencv_version\
+        && mkdir build \
+        && cd build \
+        && cmake \
+        -D CMAKE_BUILD_TYPE=Release \
+        -D CMAKE_INSTALL_PREFIX=/usr/local \
+        -D BUILD_EXAMPLES=ON \
+        -D OPENCV_GENERATE_PKGCONFIG=ON \
+        -D PYTHON3_NUMPY_INCLUDE_DIRS=/usr/local/lib/python"$pythonVersion"/site-packages/numpy/core/include/ \
+        -D OPENCV_EXTRA_MODULES_PATH=/home/opencv_contrib/modules \
+        .. \
+        && make install/strip \
+        && cd /home \
+        && rm -rf opencv opencv_contrib
+
+WORKDIR /home
+
+COPY Sample-Code-Cpp-Unix /home/sampleCode
+
+CMD ["bash"]

InstallScripts/docker/Sample-Code-Cpp-Unix/CMakeLists.txt

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+# SPECIFY THE MINIMUM VERSION OF CMAKE REQUIRED
+cmake_minimum_required(VERSION 2.8.12)
+
+
+# SPECIFY YOUR PROJECT NAME
+PROJECT(sampleCode)
+
+
+# Enable C++11
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
+
+
+SET(OpenCV_DIR /usr/local/lib/cmake/opencv4/)
+
+
+# MAKE SURE OPENCV IS INSTALLED CORRECTLY
+find_package( OpenCV REQUIRED )
+
+
+# INCLUDE OPENCV DIRECTORIES
+include_directories( ${OpenCV_INCLUDE_DIRS})
+
+
+# MACRO TO COMPILE CPP FILES
+# Do Not Edit
+MACRO(add_example name)
+  ADD_EXECUTABLE(${name} ${name}.cpp)
+  TARGET_LINK_LIBRARIES(${name} ${OpenCV_LIBS} )
+ENDMACRO()
+
+
+# COMPILE CPP FILES USING THIS LINE
+######## EDIT THE FILE NAMES ########
+add_example(sampleCode)
+#add_example(sampleCode2) and so on

InstallScripts/docker/Sample-Code-Cpp-Unix/sampleCode.cpp

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+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/opencv.hpp>
+
+using namespace cv;
+
+int main(void) {
+
+	// Read image in GrayScale mode
+	Mat image = imread("boy.jpg",0);
+
+	// Save grayscale image
+	imwrite("boyGray.jpg",image);
+
+	return 0;
+}