Lots written on that, some with a lot more details, others the quick way.
One quick and easy way would be to create a graphic of an arrow or opened circle and place it on Video 2 directly above
the sports footage on Video 1. Then you could keyframe the Motion Position property to follow your player across the footage.
See Applied Effects/Applied Effects Palette/Motion Panel expanded and Position property.
The circle can be created in the Titler.
At another forum that I used to frequent, a user who is in the business of sports video contributed to a thread on this type of subject. It is long and
detailed but may be of interest.
Please let me know if you need clarification on anything that I have written. Or if you would like more details on keyframing various properties across the video (Position, Scale, Opacity, Volume, and a variety of effects).
As ATR states, "lots has been written... " and that means that there are many ways to do what you want.
In addition to the methods linked, here are some other possibilities, though there will probably be some technique overlap:
Steve Grisetti has also published a very effective, yet simple means of "highlighting" an object with PrE. He applies the Lighting Effect (Advanced Effects>Lighting in PrE 11), and creates a "spotlight" effect, by turning the Ambient Exposure down. Quick and effective.
Yes, lots of possibilities.