The mostly likely explanation is you are prone to motion sickness. A small percentage of people experience dizziness, nausea and possibly headaches while watching motion pictures or playing video games.
In the context of TCM the liver system governs the eyes. The liver yin specifically nourishes the eyes and assists with vision. If you are particularly sensitive the visual stimulation can temporary disrupt the liver yin Since the liver yin also functions to keep the liver yang in check, the disruption can cause the liver yang to rise. The rising of the liver yang can result in headache and nausea.
That would be my best guess, there are other possible explanations within the framework of TCM theory.