How can automatically upload pictures and videos taken to google drive?

I'm having trouble automatically uploading the picture and video taken with my camera to google drive, I followed the steps on this site: http://ift.tt/164PXS0



But I don't have the Auto Backup option, I have my gmail account to sync google drive but still no luck, I have a S5 Mini with 4.4.2 android version, if anyone has a step by step or a solution to my problem please give it to me...thanks!!