vector containing pointers to another vector

Here's is what I have. I'm not sure of how to create a new vector containing pointers to people.

Code:

void FilterByBirthMonth( vector<Person*> &people ) 
{
	int month = 2;
	for(size_t i = 0; i < people.size();i++)
	{
		
			if(people[i]->birthDay.getMonth() == month) 
			{
                         //need new vector here
			}

	}
}

Create a new vector containing pointers to people.

Loop through the existing people vector and, if the person in the vector
has the birth month specified by the user, add the person to the new
vector.

Do you know how to populate any vector?