Trumpet vine is an invasive weed! It is sold at nurseries and they don't mention this. Don't plant it unless you are prepared to have it everywhere in your yard. I have had it migrate from the front of the house to the backyard. There is no stopping it's advance. It will even climb the bricks of your house and crack the mortar. The seed pods are similar to milkweed and will burst and float seeds everywhere.
Yes, it is pretty and yes, it attracts hummingbirds, but let it do it in someone else's yard, not yours. Leave it at the nursery.
This is a page about starting a trumpet vine from seed pods. Starting new plants, such as the trumpet vine, from seeds is cheaper than buying a plant from the nursery.