Create An Contact Shortcut for Hangouts How can I create a Hangouts contact shortcut for video calling on the desktop for Samsung Galaxy Tab A ( Android 5.0.1) ? I searched it a lot of. But, I cannot find any solution ? Any ideas ?
It is not possible to do something like that. 

You have 2 options: 


Create a widget that the Hangouts app provides for that
Use a custom launcher, to make a custom shortcut to the specific function/activity


Since the app doesn't provide such a widget and the 2nd option can at best open your contact list from a shortcut (tested it), there is unfortunately no other option to get something like that.