Sorry it took so long to get back to you,
has she foaled yet???????
I'm sure there are videos out there, you could try phoning a local stud to see if they have any footage, or if they have any mare, foaling, or very near foaling.
You could also try your local saddlery and see if they have any vidoes.
Make sure the mare is on her own as well, other horses may try to steal the foal or worse hurt it.
Remember if you are unsure about anything ask your vet.
Also ask the vet about the mare straight after foaling, how long before you should assist the mare if the placenta has not fully come out of the mare, the colour of placenta.
Make sure the foal is drinking, and has had its first poo within a few hours, colts are prone for getting constipated, if the foal hasn't pooed for a while and it looks uncomfortable, head down not looking happy trotting, kicking etc, seems to walk around on tip toes, call the vet. don't leave it.