On on your iPad.
Choose Portrait mode.
Hold your iPad in front of you, then frame yourself in the portrait box.
Drag on the right side of the screen.
The Depth Control slider appears on the right.
Drag the slider up or down to adjust the effect.
Tap the Shutter button to take the shot.
After you take a selfie in Portrait mode, you can use the Depth Control slider in the Photos app to further adjust the level of background blur. See View, share, and print photos on iPad