Fade Camera Occluders (4.14+)

100% Blueprint component that detect every occluder (static/skeletal mesh) in front of the camera, even if it is a component of a blueprint, and fade them out to keep the character visible. This effect can be seen in many AAA games.
There is a very simple way to change the color of the transparency, but if you want to create your own style, with a different transition you can do.