How to make a constructor with unknown number of parameters?

I'm writing a geometry class Polygon which has a private field std::vector points where Point:

struct Point {
    double x,y;
}

I need to construct a polygon with an unknown number of points using templates.

I've tried

template<Point &head, Point &...tail>
Polygon() {
    this->points.push_back(head);
    Polygon(tail...);
}

But when calling Polygon polygon = Polygon(Point(1, 4), Point(14.5, -15), Point(0, 0.0));, it fails with

error: no matching constructor for initialization of 'Polygon'

What's the problem and how to fix it? I'm using C++14