How do I connect my early 2010 Wii to my 2015 iMac?

Hi so I don't have a TV (I know shocking) to hook my Wii up to anymore and I wanted to know how I could use my iMac display as a tv screen. The Wii is an older model, maybe brought five years ago while the iMac was made late/early 2014-15. How can I hook them up so that I can play Just Dance through it? Literally, I only want to play Just Dance. Are there some adapter cables I would need to get? Whatever help I can get is appreciated.