For others looking for non-headless command line startup:
/Applications/Genymotion.app/Contents/MacOS/player --vm-name "xxxx"
Get a list of vms:
$ VBoxManage list vms
"Galaxy Nexus - 4.2.2 - API 17 - 720x1280" {56d8e3aa-ecf8-483e-a450-86c8cdcedd35}
Where xxxx can be either the name or the id:
/Applications/Genymotion.app/Contents/MacOS/player --vm-name 56d8e3aa-ecf8-483e-a450-86c8cdcedd35
/Applications/Genymotion.app/Contents/MacOS/player --vm-name "Galaxy Nexus - 4.2.2 - API 17 - 720x1280"
You can kill it with a normal process kill:
ps | grep "Genymotion.app/Contents/MacOS/player" | awk '{print $1}' | xargs kill
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