Nexus 5 camera launch shortcut using volume keys from standby/sleep mode? topic

I was wondering if there is a mod that you can activate the camera from the standby lock screen by holding the volume key? as i don't listen to music on my phone so that wont matter to me if the volume key is used for camera shortcut.

At the moment i am using gravity box and xposed on 4.4.4 and i set the volume down key to trigger the flash light.