I drive 2004 Hyundai Elantra. Its CD player, 50645P, is not ejecting CD and CD is
stuck inside and it is also not sensing any CD. So only radio mode is working.
Any advice to eject CD or install a new CD player would be highly appreciated.

Thanks.

TAke the radio out and take it apart to get your cd.Buy a new aftermarket cd play to replace it with,The stock ones are know for doing that.