[GRC]

Much will depend on the deck, but my inclination would be to get some plastic tools, cocktail sticks, toothpicks, etc. and CAREFULLY unpick the tape from all the guides and rollers, taking X care not to touch the head drum.

If you can access the reel hubs and get the tape back in the cassette, all good and well. If it becomes necessary to cut the tape, do so.

Then power up the machine and try to eject it