use List::Util qw[sum];

foreach my $track (@$tracks)
{
	my @points = map { @{$_->{points}} } @{ $track->{segments} };
	
	my $count_of_points = @points;
	my $total_elevation = sum 0, map { $_->{ele} } @points;
	my $average = $total_elevation / $count_of_points;
	
	printf "%s = %d\n", $track->{name}, $average;
}