I have a Samsung Galaxy S4.
When you say "Make sure “Multiple widgets” is enabled". I don't have that on my screen and I do have Jelly Bean 4.2.2
If you own a Samsung Galaxy S4 or other Android device with Jelly Bean 4.2.2 you have already known about the benefits of Lock Screen widgets. In this tip we learn How to Add Camera Shortcut on Galaxy S4 Lock Screen?
1.Go to Setting
2.Go to My Device tab
3.Tap on Lock Screen
4.Make sure “Multiple widgets” is enabled
5.Tap on “Lock Screen widgets”
6.Tap on “Favorite apps or Camera”
7.Choose “Camera” to swipe the default lock screen from right to left to open camera
Read More Galaxy S4 Tips and Tricks