It doesn't always have to be sharp!

**Disclaimer** To get proper soft focus, you need to either put your video through a filter after you finish shooting it,
the other way is to use a lens with that capability.

If not just try and focus on a part of your subject's face or body at a close proximity. That way, their entire body isnt fully in focus.
This gives some mystery as well as accentuates whatever you on. Try the mouth, an ear, hair or just one eye.