What they show in the video are called tacos not burritos. Burritos are not commonly eaten in Mexico (though they can be found in certain places, mostly in northern Mexico). The food festival shown in the video (which takes place in central Mexico) is not only about tacos (as you can see in the video). They use the ingredients you mention, and many more, in the preparation of several other dishes as well (some of which can be seen in the video).