Intel QuickSync on OSX
Using Apple Compressor, it's automatic, depending on your machine &amp; settings.  

Hardware acceleration is enabled automatically within Compressor. If your system has the right set of chips, and you select the right compression setting, hardware encoding kicks in.


Hardware encoding is available on all shipping Macs that use an i5 or i7, Sandy Bridge or Ivy Bridge processor; except the new Mac Pro.
Hardware encoding is applied to QuickTime and MPEG-4 compression that uses the H.264 codec; but not to Blu-ray Disc compression.
Hardware encoding cannot be used for multi-pass encoding. In fact, turning on multi-pass encoding turns off hardware encoding.


Source &amp; for further analysis : Compressor 4.1: Hardware Acceleration