Drawbar pull for 747-8 is 31,100 kg.
Humans can safely push 20% of their body weight.
So you need 155,500 kg of humans.
If we assume 80 kg per human and round up we have 1950 humans.
This number is for using only your arms, so using whole body, as would probably be the case here, you can double it.
So 975 (1950) humans to push with whole body.
Pull is more efficient at 30%, so only 103667 kg of humans needed.
This adds to 650 (1300) humans of 80 kg rounded up with whole body.
No idea if this is actually true, although numbers are (barely) low enough that someone might have tried. The big practical issue is connecting all those humans to the plane.
Also, the actual numbers to move the plane at all should be significantly lower. This is the number of people needed for safely operating the plane in normal airport conditions including slight upward slope and some engine thrust resistance.
If you only need zero slope and engines off, you should be able to cut the numbers by more than a third. That you are happy with much lower speeds and distances than Boeing should cut the numbers further.
Also, what I knew and intended to mention but forgot. These are the safe numbers for constant and repeated work intended to avoid workplace injuries. Peak exertion for a one time stunt is something else. I am providing these numbers as a starting point because the exact circumstances are not mentioned.