The ImageMagick can be installed using a simple cPanel script (/scripts/installimagemagick) in the older version of cPanel, but in newer versions of cPanel with EasyApache 4 uses another method to install it.
Step 1: yum install ImageMagick-devel ImageMagick-c++-devel ImageMagick-perl
After installation verify the working using:
/usr/bin/convert –version
Install ImageMagick php extension
Step2: /opt/cpanel/ea-php56/root/usr/bin/pecl install imagick
Add below line in to the php.ini file
extension=imagick.so
service httpd restart
/opt/cpanel/ea-php56/root/usr/bin/php -m | grep imagick