If you are using a DSLR it’s relatively easy to achieve a selective focus by adjusting your f/stop. Using a smartphone makes it a bit more difficult. However, there is an easy way to do this using an app (for Macs and iPhones) called Fotor Photo Editor. Here’s what you can achieve in a few clicks.

Notice how the center is sharp and the rest is slightly soft. Using Fotor you can move the area you want sharp and adjust how much blur you want. Nifty.