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OpenCV Video Writer on Mac OS X

For educational reasons I've decided to create my own CA. Here is what I learned.

Lets get some context first.

Run the following in the terminal:

Install the gcc-7 packages:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update
sudo apt install g++-7 -y

Set it up so the symbolic links gcc, g++ point to the newer version:

	cd /System/Library/CoreServices/Spotlight.app/Contents/MacOS
	sudo cp Spotlight Spotlight.bak
	sudo perl -pi -e 's\|(\x00\x00\x00\x00\x00\x00\x47\x40\x00\x00\x00\x00\x00\x00)\x42\x40(\x00\x00\x80\x3f\x00\x00\x70\x42)\|$1\x00\x00$2\|sg' Spotlight
	cmp -l Spotlight Spotlight.bak
	sudo codesign -f -s - Spotlight
	sudo killall Spotlight

	I did the following to install devtoolset-7:
	yum install centos-release-scl
	yum install devtoolset-7-gcc-c++

	Every time I want gcc to default to using GCC 7, I run the following:
	scl enable devtoolset-7 bash

	输出转换后的文件时包含 EXIF 元数据(2017年内)
	色域转换(2018年初)
	在 Windows 资源管理器直接显示 HEIF 图片的略缩图(2018年初)

	all done。