The meaning of "point" in the context of a line of scrimmage

Apices is one of the plural forms of apex:

[Merriam-Webster]
plural apexes or apices
1 a : the uppermost point : VERTEX
       // the apex of a mountain
1 b : the narrowed or pointed end : TIP
       // the apex of the tongue

The more common word used in the definition is tip.

A football is an oval with two tips, and point is being used as a verb, not a noun.

As such, it could be rephrased in the following way:

… one of the two tips of the football which point toward either the defensive side or the offensive side.

For a visual representation, look at this picture, which shows a football at the line of scrimmage. One end (tip or apex) of the football points to the defensive side, while the other end points to the offensive side:

The phrasing itself might have been simplified. In addition to using tips, it could have instead said something like the following:

… the tips of the football which point toward the defensive and offensive sides …