Do you mean black holes formed from stars? I think conventional wisdom conveys that just about all of them form when stars or a certain size can no longer maintain their homeostasis.

Literally, the first Google result for "black hole star"

https://en.m.wikipedia.org/wiki/Quasi-star

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They are a thing, and are very much a part of modern cosmology and astronomy. We have the ability to detect distortions of space and time, and have even imaged the halo of black holes.

Carl Sagan, in the original Cosmos TV series, had a sequence of pictures from the Lewis Carroll books about Alice in Wonderland. Ah, found the clip. That might help you understand the idea: If you had enough mass, the pull of gravity could exceed the ability of light to escape it. So you get a black hole -- black because visible light doesn't escape.

I am guessing here, but for a quisi star to be possible would it not require a primordial black hole at it's center? As opposed to a stellar black hole.

I know that primordial black holes are currently only theoretical we don't truly know if they exist or not.

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This is the video. https://www.youtube.com/watch?v=aeWyp2vXxqA (if it isn't this is great, like all of Kurzgesagt's stuff)