Is this color film or B&W?
If B&W, you can either make an internegative, i.e. print onto negative film and then print normally from that. Or you can print directly onto paper and reversal process it.
If color, you pretty much have to make an internegative. The only direct positive process is Ilfochrome, which is expensive and definitely overkill for printing from 8mm positives.
In either case, don't expect great results. The image area on 8mm film is tiny: about 1/32 of that of 35mm film. You will get quite visible grain, even on prints of moderate size. Furthermore, individual frames of movie film often show motion blur which is not objectionable when viewing the movie, but can be an issue here. The perceived amount of detail in the picture is much greater when the frames are shown in rapid succession, as intended, than when you pick out one still.