Yes. You can buy Positive Pressure or Balanced Heat Recovery Ventilation HRV from www.climateathome.nz and install yourself together with an electrician.
To find an electrician to carry out the electrical work when installing your own home ventilation system start here at www.masterelectricians.org.nz/find-electrician.
Many people do install their own home ventilation system. Plan your layout and ensure you have the right system for your house type.