Generally when your machine boots, the firmware (UEFI or BIOS) looks to the hard drive to trigger the boot-loader. However, Apple Mac’s have a special boot-loader stored in their firmware along with the UEFI. Because of this, the OS X installer does not include a boot-loader on its own. To get around this, Hackintoshers install Clover or Chameleon with custom installers, but there is a way for us to get our own firmware based boot-loader.
ProjectQ, a Kickstarter project from a while back, aimed to create a motherboard with a firmware boot-loader capable of loading any OS. They ended up creating the Ozmosis firmware, which is loaded into a motherboard would allow vanilla OS X to function as if it is being used on a real mac. This includes using an unmodified installer.