Even though you described computer hardware, I am assuming that your APEX DVD player is
stand-alone. (I think that APEX is a brand for stand-alone players.) Your DVD player may have what's called Digital Optical Out. If it does, then you may be able to use a convertor. VocoPro sells them.
Oops just re-read your original post. I'm leaving the convertor part for those who need it.
There are video capture cards and TV cards. I imagine that one of these will be your answer.