[Sasino97]

If you are using Incognito's streamer plugin it should be easy to do it by creating and destroying and then recreating a colored id 0 map icon, every 2/3 seconds on the position of the most wanted player, but it won't give a nice result.

If you instead meant to show its normal marker to other players you could find this function useful:
https://sampwiki.blast.hk/wiki/SetPlayerMarkerForPlayer