The person above also pointed out that things like machine learning are often better done on a GPU anyways. Certainly if you offload your video encoding to your GPU it does change the value proposition of that entirely.
They asked what people are using it for right now and video encoding is one of those things. This is very direct. They didn't ask about solutions or what they should do about a particular problem, just about what people are currently doing.
Video encoding, especially newer codecs like HEVC and VP9 are CPU intensive and SIMD optimized tasks that people are doing right now.