Why do you think that the presentation was done in 1964?

On Youtube there is no mention about the date.

OS/360 was announced in 1964 but it was first delivered more than a year later.

I doubt that such presentations were done about a product that no customers could use and which might still be changed until the first deliverable version.

So I believe that it is unlikely that this presentation was done earlier than 1965 and it is likely that it was not done before 1966. The first OS/360 versions were delivered in November/December 1965.