This is an easy way to blur your background in Photoshop with more control than some of the Blur choices.
1. Duplicate your image layer.
2. Select the area to be blurred.
3. Filter > Blur Gallery > Field Blur
4. Place the “push pin” in an area to be blurred and adjust the amount with sliders at the right.
5. Add more push pins and adjust all as you’d like. (see screen capture below)
6. Press Enter to save, deselect (Ctrl/Cmd D) and save new version of your image.