Probably the easiest way to do a “walkthrough” type mechanic would be to use the First Person shooter Blueprint Template, then delete the gun mesh (remove the shooting functionality). Then, you basically have a grounded first person walk through view 
.
For tips on how to use the editor you can check out:
Working with Blueprints: Blueprint Quickshot | v4.7 | Unreal Engine - YouTube
Working with the Editor: null - YouTube