I think Wyze will be coming out with a solution similar to what you want. The VP of Product indicated they are working on something that will allow us to record camera video to a local harddrive:
So, they are working on some kind of way to do NAS (store video onto a network harddrive). We just don’t have any more details than that at this time. He also mentioned that they are trying to move toward having things be more local-oriented instead of cloud-dependent.