It is quite hard to tell from this footage what the correct call is.
The first important point that needs to be made clear is whether or not the offensive player actually had a reasonable chance to make a play at the disc. If not, then no foul.
The second important point is whether or not the defender had already established “rights” to the space which the offense player ran into. If so, then the offense player has actually caused the foul by running into the established path of the defender.
It is hard to tell from the footage either of these things. It would also have been difficult for either player involved to have been able to determine these things.
This is an example of where rule 1.5.1 is very important:
1.5. The following actions are examples of good spirit:
1.5.1. informing a team-mate if they have made a wrong or unnecessary call or caused a foul or violation;
In this instance the players should seek information from their teammates and the teammates should let them know if there was a foul, and who caused it.