PHP imagick module is not a part of the default installation yet. Here is some easy steps to enable php-imagick module on your system.
1. First install the required development and dependency packages :
yum install make gcc php-devel php-pear ImageMagick ImageMagick-devel
2. Compile php-imagick module :
pecl install imagick
3. Add the extension to php.d as followed :
echo "extension=imagick.so" > /etc/php.d/imagick.ini
4. Restart your Web server :
service apache restart
OR ;
service php-fpm restart service nginx restart
5. Optionally, you may remove the compiler for security purpose :
yum remove make gcc