This floating photo is called levitation. This photo can be produced using advanced camera or smartphone. Typically, these float photos can be made due to leap or just the effect of a chair.
How to make it? Easy!
Choose the best spot
Bring a seat to make a buffer
choose pose, eg kayak photo above, try not to face the camera, choose a natural pose
Take a photo
5.Edit use smartphone applications Picsart Photo Studio, Picsay Pro - Photo Editor, Clone Camera, Pixlr Express, or High Speed Camera.