How to get BASIC soft body physics?

Please watch the video above to see what kind of soft body physics im talking about ^

Not asking for anything crazy hard “impossible” or extravagant, just want to know how to get the basic soft body which reacts to other rigid bodies, as shown in the video

A game simulator from 2005 can simulate such physics, so im sure UE4 from 2018 can also do so. Please let me know.