Why can't you see video of a shuttle entering space?

Answer 1

It's high enough into space and far enough away over the Atlantic Ocean by that time that the cameras can't see it. You can see launch video but space isn't a hard boundary. Oftentimes the astronauts' shades might be closed due to sunlight because they don't have to see what's outside on the way up.

NASA says space begins at 122 kilometers (76 miles). This specific number is the approximate boundary where the atmosphere begins to exert noticeable drag on an object so it's based on a scientific fact.

The USA says space begins at 80 kilometers (50 miles) and says anyone who passes this altitude is an astronaut.

Thus, there's no clear cut determination of where space really begins. The atmosphere extends much farther than 76 miles and fades away.

Answer 2

The main reason is that there is no atmosphere in space to scatter light, which is why the sky is dark. A shuttle entering space would not emit or reflect enough light for us to see it from Earth. Additionally, the distance between Earth and space is vast, making it difficult for the human eye to detect such small objects in the vastness of the universe.