Are they small enough already to fit onto the dvds? If so, you can use ImgBurn for this. Just import them in Build mode and output straight to your dvd burner. ImgBurn should recognize them as BD video and burn in UDF 2.5 mode I believe, but you can also set that manually. I have burned a few this way, and always set it manually.
What you are making here are called BD-5 or BD-9 disks, depending on whether you burn to single or double layer disks. It will be Blu Ray structure on a dvd rather than on a blank Blu Ray disk. This will not play on a regular dvd player, and not all Blu Ray players support these disks either.
If your intention is to play on a regular dvd player, you will have to reencode the video to fit dvd standards.