I have been filming girls for a long time, but only if they show their face in the film. Sometimes a get a good movie, it depends on the girl and the tools you use.
For the girl you can do to little... sometimes she is trying to avoid looking at the camera or she stops the action and does something to spoil the movie. If she delivers a bad performance don't see her again, remember that paid her for the filming. There's nothing else you can do.
Regarding the material, that's what I do and advise:
-Use at least two cameras. I use the SJcam SJ7 Star, which is a cheap version of the GoPro and allows me to film in native 4K and use up to 32 Gb micro memory cards for 3 hours of filming. It used to have a problem provoked by a cool aesthetic design but not tested that made it a little bit practical, probably solved by now. The camera metal cover tended to overheat. It could be solved with the next two pieces of advice.
-Use a tripod for the 3rd person point of view. It also avoids the vibration and shakes or you being the cameraman and the actor.
-Use GoPro accessories like the magic arm, or suction cups for the POV. Also, use cages/boxes that allow you to pick up the camera easily.
-Edit the movie and select only the best takes and angles. The editing software NHC Video Pad is free, good and easy to use. Also, it is quite easy to find cracks and serials to open the pro features. One of its advantages is that it allows zooming!!! So you can select take that otherwise they wouldn't be good, but after zooming you remove/hide the part that you don't want in the movie

-Edit the sound. After creating the film that you wanted, use the original master sound and the sound of your movie to create the sound that will add to the final movie version. NHC also have WavePad that is very easy to use. Editing the sound basically consist of opening your movie with WavePad to extract the audio file. Doing the same with the master. Selecting and counting the time of the sound that you want to replace and finding the same time in the master, then copy paste in the right time point in the timeline. Finally, remove/unlink the sound of your movie and add the sound file that you have created, which is of the same time length that the one you are replacing. Finally, save the movie with the new sound as a new file. Repeat until you are satisfied with the sound. I have created new conversations and replaced wrong conversations with seducing conversations using this technique.
-Hint: I normally star the movie by the end, recording a BJ with a big cumshot on the girl.
And, please, do not upload the movies to xHamster, Vimeo, PornHub or the Tubes. They could stop showing their faces in the movies

Cheers.