You can still use the principles of a kicker and fill light out in the field. When you are trying to light a person it is best to bring at least two types of reflective devices. You can purchase professional reflectors for a reasonable price from a location that sells video equipment, but it is just as easy to make them at home. You are going to need a white card, which can be substituted with a cheap white poster board. A foil reflector is great, and you can simply take a thick piece of cardboard and cut it into a large circle. Then cover it tightly with foil. This should be able to reflect a beam of sunlight very adequately on to the subject. The strong foil reflector is great to use as a backlight in strong sunlight, while using the sunlight itself as the key light on the long side of the person’s face. Employ the white card on the other side of the person’s face, and bring it just close enough that their natural skin tone is illuminated. If you only want to use a reflector use it for the fill light in place of the white card. This is where professional reflectors are great because of their flexible nature. The silver foil is the standard for using a fill, but many come with a gold foil option as well. That is great for using as a fill on someone with a very light complexion, and makes them appear as if they have a golden tan. Though you can create this reflector at home it is not going to have the same versatility as the store-bought reflector because it will not have the ability to bend in the same way as the consumer ones are designed to. Always make sure you bring an object that can act as a shading mechanism if the light gets too bright on the subject. You can use the reflectors you are already bringing, but they will create heavy fall-off from the light because they are completely solid. If you have people helping you shoot this video then try bring a thin, white sheet and holding it up in between the sun and the person’s face. That way the direct sunlight that you are using for a key light on the long-side of the subject’s face will be much more diffused, although not all together eliminated.
Controlling the light while filming outdoors can be a challenge, but with some advanced planning and attention to detail, you can still produce quality video recordings.