You scroll the uv in a shader in either unity/ue4/game engine you work with.
They explain most basics about shaders with panning in this post, and if you just skip the panner node you can manualy control how far you want it to pan instead of constantly panning. Instead of using a constant for the off-set as they do you just make a curve between 0-0.5 or how far you want it to scroll.