1. Open a video in mpv.
2. Press a to open advanced menu.
3. Optionally, press c and select the desired subtitle lines with the interactive selection.
4. Press g to open the Add dialog in Anki.
5. Add dictionary definitions using software like GoldenDict, Qolibri, etc.

After the card is created, you can find it by typing added:1 in the Anki Browser.