Vegas currently doesn't have MacOS native version. Only PC Windows. But you can use Bootcamp in Macbook to install WinOS alongside MacOS. On this way, you can have full GPU support.

If you don't need the native GPU support of Bootcamp, you can use VMware Fusion or Parallels Desktop, or even the free VirtualBox to run Windows on OS X. This way you don't need to reboot.

Here the example of Vegas Pro running on JohnnyRoy's Mac OS X desktop using VMware Fusion's Unity mode:

He even can drag and drop any files from his Mac directly into Vegas Pro.

(Reference to JohnnyRoy's post)