Kili Technology provides a simple classification interface for video. You can easily navigate in the video and change the playback speed.
For single choice, choose input: radio button.
For multiple choice, choose input: check box.
For dropdown choice, choose input: dropdown. Dropdown is especially relevant for long lists. It allows to search, and to filter out the list easily.
To build nested classification, choose input: check box. See configuration in the customize interface section.