As said, if you can give us an idea what the power is for we can possibly give a better answer. For a generic answer check for a fuse and repay panel under the hood. See if there is a fused power post that you can add an additional wire and ring terminal to pull your power. If you only need minimal power you could try a fuse tap.
LinkTo use a fuse tap you remove an existing fuse from the fuse block and plug the fuse tap into the empty slot. Then you plug the previously removed fuse in the fuse tap. This restores the function of the removed fuse. After that you plug a second fuse into the fuse tap and run now fused power out the pigtail to your new accessory.