I'm not sure if you'd be able to do this with you're application, but I believe there is some thing built in that you can use. In CTF, Oddball, and juggernaut-type games, if objectives are indicated on screen, the image drawn over your objective will change depending on whether or not you can see the person. For instance, when the enemy has your flag, you may not be able to see where that flag carrier is when that player cannot be seen, but when that player can be seen a red indicator may appear over their head.
This is what I mean. <- The enemy team's flag goes from a diamond to a flag when the player holding it could be seen.
Someone correct me if this is not the process used (and sorry for the low-resolution).
If I am correct, I will not judge the difficulty of working this out.
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