How do I add a widget to my lock screen?

I am running a fully stock Android 4.4.4 Nexus 5, with Nova (Premium) Launcher. Since I first bought this device, I have heard, read, and been told that adding widgets to the lock screen is possible, as long as it is enabled in settings. Well, it is, but I can't figure out for the life of me how to actually add them. Sorry if this is a Super Newb question, I've Googled, Binged, etc... With no luck whatsoever. The only thing I seem to ever come across are instructions on how to enable them, which as I stated, I have done.