You are using 'class_filter_array', but you haven't specified 'class_filter_type'. Without the type of class filtering, the filter array won't be used at all. The possible values for the type are 'include' and 'exclude'.
Use 'include' to restrict the fetch to objects of the content classes specified in the filter array. Use 'exclude' to fetch all objects except those of the content classes specified in the filter array.
So basically, all you do now is fetching the most recently published node instead of the most recently published video.
And do you have any special reason to use a foreach? It's not wrong of course, but you are limiting the fetch to 1 result so it's a bit of a waste to loop. You can also access the first element of an array by using an index, e.g. $video1[0].
