did u use the scroll to behaviors or the scroll to function
and another problem you might also be having is u don't have unbounded scrolling and one of them is going out side the layout
also to zoom out u use the set layer scale or layout scale and just slightly decrease it if both or either players are outside the box
then have a inner box and i they are both in it to slightly zoom in until the max amount for zooming in
to tie the two players to together you give one of them the pin behavior and pinit to the other player rope style in the events