Does looking at the private parts of non-Muslims (such as in pornographic videos) affect the viewer's good deeds or bad deeds on the Day of Resurrection, and is there any authentic hadith concerning this?

It is not permissible to look at裸露 images, due to the Almighty’s saying: ﴿Tell the believing men to lower their gaze and guard their private parts. That is purer for them. Indeed, Allah is Acquainted with what they do.﴾ This is also because looking at them is a means to derive pleasure from them and to perceive their beauty. There is nothing to indicate that the person who looks at them will have their good deeds taken away or have sins placed upon them, nor do those who intended to display them have any right to do so. However, if a Muslim is photographed without their permission, that is an injustice and an infringement upon their right.