Player display on custom map renderer

Good afternoon. I know how you can change the render of the map, set your own image there and change the display completely, but one question remains: How to enable the display of the player on this map, because. all MapRenders are removed, how can I implement this myself on a custom map?
Im tried to use addCursor(), but I don't understand how to convert the player's coordinates and his direction of view to byte variables
Ver: Paper 1.12.2