Over the last couple of years, we've been told 3~4 minutes max and no music. Coaches like to see the player with and without the ball in game situations (feedback from coaches).
As parents, we tend to think that scoring and shooting is the best highlights but in reality, the video is supposed to catch the coaches' attention about the overall ability of the player. Consider using footage from several games and not just few games. Hopefully the video leads to a dialogue further down the process.
Instead of thinking about the video in terms of highlights of plays, think about it as highlight of both physical and mental abilities. Here are some examples:
- use of both feet as situation requires it
- movement off the ball in making runs, taking defenders away to create space, anticipating developing plays by attackers and so on
- passing and reading the field with accuracy and methods (keeping the ball on the ground and in front of receiving player running in full stride)
- calmness and decision making under pressure in tight spaces
- heading the ball with control and all directions
I'm sure there are others but those are big part of players capabilities. In addition, make sure you include GPA, SAT/ACT scores, physical info (i.e., height, weight, DOB), grad year and reference names at the end for coaches to contact for further info.
I have made two videos for my kid. One for his plays (e.g., scoring, passing, attacking and defending), and another for his skills (e.g., both feet, decision making, tactical knowledge of the game). Each around 4 minutes and with an intro of him talking about himself. Also have text overlay to maintain focus on the subject and periodic marking of him on the video to emphasize where he is on the field if its a wide angle views. No music or voice over.
These days, it is all likely that they will be watching it on their phone so I use HD/4k footage and crop into SD resolution to effectively zoom into the subject as well as keeping wide view at full HD. Each highlight segments are typically less than 10 seconds.
Last, if the coach is interested, he will ask for the whole game footage. We have provided full game footage to few coaches and gotten positive feedbacks about certain portions of the game video so we know they've actually watched it. If asked for whole game video, make sure you provide a short descriptor for when your player is in the game and any specific highlights within (e.g., Starts and scores in 12.35min sub'ed out 35 min, then re-enters at 50 min and 2nd goal 54.02min of the game, kind of info).
Hope this helps - good luck.