That will be hard to do unless she is somewhat regular about when she poops (after meals is common). You will have to count on her to be able to tell you, and at her age, it may stilll be awhile before she can reliably do that.
And, of course, before she can reliably notice and take care of her own urges, you will be the one who is "trained," not your daughter. Still, you can save quite a bit on diapers and cleanup time if she is able to use the potty often.
But poop training very often happens after pee training – for some children, it takes months longer. It's a different physical signal than pee, it usually takes longer and requires quite a bit more effort. When you do notice that she has recently pooped, you can just be curious about it? "Hey, sweetie, you pooped! Good for you! Did you feel it coming? Can you tell Mommy when you feel it coming next time? Thank you for trying."
And then show her that the poop goes in the potty; dump it in and let her flush if she likes that. Eventually, if there's not too much pressure, she will get there.
Meanwhile, here's a wonderful, informative website you might find helpful. It gives a few variations on"readiness" checklists, plus tips on various training strategies, the best ages to start them, and the advantages and disadvantages of each approach: http://www.parentingscience.com/toilet-training-readiness...