Softwares for GPU accelerated rendering
Adobe's CC suite will use the GPU, but the benefit you see from it depends on the power of your GPU compared to your CPU. This feature set is called the "Mercury Playback Engine" and contains, among other optimizations, CUDA support for certain realtime effects (scaling, crop, etc) as well as encoding/decoding. 

However, most integrated or mobile GPU's aren't powerful enough to make it worth using CUDA acceleration. Fortunately Adobe is smart enough to transition back to CPU rendering when it detects wimpiness in the GPU department.

With a dedicated graphics card like a GTX970 you'll see a significant decrease in render time - perhaps as much as 50% (so I've heard, anecdotally, from other youtubers like yourself).