Where for you to achieve this there are things you need to consider, this will guide you and help you to be able to do this even in most camera with small lens.

What you need to consider to get blury background

First you need to consider your apparture which controls the light. You wanna make sure your apparture is set to +1 depending on the time of the day you shooting you can also achieve this with a lens with high apparture e.g f5.6 that is a good lens to work with.

Next thing you wanna consider is your distance between the subject just make sure you are not too close i cant give a specific distance cause every lens will give you diffrent distance so just make sure you are not too close otherwise you might end up getting your foreground blur. ![rikky-alvg)