I had a similar problem when I was potty training my son. My first attempts began when he was 1 1/2 yrs old. I tried videos, books, rewards, stickers, progress charts, songs, and EVERY method I could find online, in magazines and books. He resisted until he was about 2 1/2, and he finally began to use the potty about 80% of the time but he still wouldn't poop anywhere but in the pull-up.
About 2 days after his 3rd birthday, HE told me "Mommy, I don't wanna wear a pull-up anymore". And just like that, he started going on his own. There were a few little mishaps once he was in regular underwear but I always kept spare pants and underwear with me for emergencies.
There was no amount of "training" that I could do for him, he decided when he was ready.