Your ski video should show how your skis perform on the snow at turn initiation, the skis' performance through the fall line, and skis' performance as you finish your turns. Good video will show the skis and your entire body in every frame.He can't stand taking video on anything that's not trees or hike only terrain
Such a video will reveal how you start your turns, how you manage your stance width, whether you initiate your turns simultaneously or sequentially, how you manage your fore-aft balance, your lateral RoM, your hand/arm management, how you manage your upper body as you finish your turns, your edge angles and whether they match, and whether or not your pelvis matches the rotation of your skis. The snow spray created by your skis will indicate your lateral weight distribution (left-right) through the turn.
When back home you can spend time looking intensely at your video to judge how you're doing with all these things. You will always have videos online of admired skiers that you can compare yourself with. Looking for such things is called MA - movement analysis. I suspect you'll enjoy doing this analysis. You can on your own figure out your strengths and what movements "need work." Many skiers can not tolerate such detailed analysis. I think, from your posts, that you will not only tolerate doing the analysis but you'll find it immeasurably helpful as well as fun in advancing your skiing.
For this kind of video, your friend will have to spend some time on easy groomed terrain, standing still at the side of the trail, pointing the camera at you as you ski towards him, past him, and down the hill below him. He will need to grab an image of your skis and your whole body as you start your run, continue to include skis and body in the frame as you ski past him (you will need to be far enough away from him for his camera to fit both your head and your two skis in the frame), and your skis and body as you ski down to the bottom below him. You will need to look at this video while out on snow to make sure the whole body and the skis are captured for the whole descent, especially as you ski past him. If he loses skis or head in the video, you'll need to do the video again.
If he refuses to do this for you, as a favor (can you bribe him?), that will be a shame. Do you ever ski with others who might do this for you?