Click Settings app.
Settings are displayed. Click General.
General settings are displayed. Click Accessibility.
Accessibility settings are displayed. You can see that Reduce Motion is set to Off. Click on Reduce Motion once.
Reduce Motion is set to disabled. Toggle the switch to the right to enable it.
Reduce Motion is now enabled and after going back to the home screen, the 3D parallax effect that had been causing you head aches won't occur anymore. So this is how we remove parallax effect on an iOS device running iOS 8.