Blender addon that generates empties that trace along points on a grease pencil path.

grease_empties.py

import bpy
from bpy.props import IntProperty

def points(strokes):
    for stroke in strokes:
        for point in stroke.points:
            yield point


class GreaseEmpties(bpy.types.Operator):
    bl_label = "Grease Empties"
    bl_idname = "object.grease_empties"
    bl_options = {"REGISTER", "UNDO"}
    
    every_nth = IntProperty("Every Nth", min=1, max=100, default=1)
    
    def execute(self, cxt):
        pencil = cxt.scene.grease_pencil
        strokes = pencil.layers.active.active_frame.strokes
        for n, point in enumerate(points(strokes)):
            if n % self.every_nth == 0:
                x, y, z = point.co
                new_empty = bpy.data.objects.new("empty", object_data=None)
                cxt.scene.objects.link(new_empty)
                new_empty.location = x, y, z
        return {"FINISHED"}


def register():
    bpy.utils.register_class(GreaseEmpties)


def unregister():
    bpy.utils.unregister_class(GreaseEmpties)


if __name__ == '__main__':
    register()