[D] Video Tracking vs Image detection

Hello All

How is the video tracking different from image detection? From my understanding, tracking within a video can be simply doing a **per-frame level** objection detection, and then using NMS to combine these object (based on the overlapping). However, my friend told me this might not be an efficient method (because per-frame level).

What are the current norm of doing video tracking? Do they run at the per-frame level?

detection image image detection machinelearning tracking video