Here is an older write-up from me where I mention some forms of jazz and post youtube videos as examples.
It's not a brilliant write-up and I would do it a little differently today for example by perhaps removing Soft Machine and adding more about jazz rock fusion, but it still might be helpful.
Since it doesn't contain any examples from jazz fusion, I can recommend it here perhaps. In the late 60s, Miles Davis and his band introduced rock instrumentation to jazz and created the jazz-rock fusion sub-genre which is often just referred to as jazz fusion or even just fusion. Some of those who played with Miles Davis were inspired and made their own jazz fusion bands in the early 70s. One of them was keyboardist Chick Corea who created the band Return to Forever. His approach to jazz fusion is perhaps a little different to that of other fusionists of his time, so it may not be the best example .. But on the other hand, Return to Forever's self-titled debut from 1972 is bloody gorgeous
Here are the first two tracks from it :
There are 3 "greats" in the jazz fusion genre. The other two are "Mahavishnu Orchestra" and "Weather Report". Ask here, search for a thread about them or look'em up on Wikipedia if you're interested!