The Jetson makes sense as many things, but it's serious overkill to be a Kodi box. It's a nice development kit that includes CUDA, and for some people it's even a nice and interesting desktop.
For Kodi and media purposes however it makes far more sense to buy either (1) the Nvidia Shield TV with the same chipset and also costs $200, if you're looking for a media player with and don't care about running your own software or (2) the Odroid C2, which is one third the cost of this, is a much smaller device (and probably more power efficient), will soon run mainline Linux (nightlies out already) and plays h265 and 4k just fine!