This tutorial shows how to install opencv on vscode (Ubuntu) for c++

Setup opencv-c++ cmake

This was gotten from https://www.learnopencv.com/install-opencv-4-on-ubuntu-18-04/

# Create your working directory 

mkdir project && cd project

#Visit  to follow the article

Change CMAKE_INSTALL_PREFIX=$cwd/installation/OpenCV-"$cvVersion" \    to    CMAKE_INSTALL_PREFIX=/usr/local \. and 
OPENCV_PYTHON3_INSTALL_PATH=$cwd/OpenCV-$cvVersion-py3/lib/python3.5/site-packages \    to   the right directory 


# Ignore step 2 in the article and do the following:

set (CMAKE_CXX_STANDARD 14)
find_package(OpenCV REQUIRED PATHS /usr/local/lib/cmake/opencv4/) 
include_directories(${OpenCV_INCLUDE_DIRS})
set(LIBS ${OpenCV_LIBS}) 
target_link_libraries( OPENCVTUT ${OpenCV_LIBS} )

# Go to your current working directory and do the following :

mkdir build 
cmake -H. -B build 
cmake --build build
ls ./build/<executable file>

To build for android  use this tutorial
https://github.com/VlSomers/native-opencv-android-template