I managed to narrow down the crashing line to
spec_version = mynteye->GetDescriptors()->spec_version;
Adding some debugging output
ROS_INFO("mynteye->GetDescriptors() = %p", mynteye->GetDescriptors().get());
gives
mynteye->GetDescriptors() = (nil)
Note ./samples/_output/bin/get_depth works for me so it should not be a device issue.