Based on the data that came from search marketing platforms RankRanger and STAT Search Analytics, Google dropped the percentage of time that video and and image boxes show up in the search results.
According to these tools, around November 13 and 14th, Google started showing fewer video boxes or carousels.
The following chart from RankRanger shows the drop:
Here is a chart from STAT showing the drop:
According to RankRanger, around November 14th as well, Google started to show image carousels or boxes 30% less often for the data set they are tracking.
Here is a chart from RankRanger showing the drop:
