I dislike saying any CPU is "too weak" to do anything because 20 years ago our processors were a lot slower than even today's ARM processors you find on phones, and I can assure you we did video editing on our computers back then. Any CPU can do any task, it just depends how long you're willing to wait.
On desktop processors (the breakdown for laptop processors is totally different):
i3 = dual core, hyperthreading, no turbo boost, 3MB cache
i5 = quad core, no hyperthreading, turbo boost, 3MB cache
i7 = quad core, hyperthreading, turbo boost, 4MB cache
At least that's how it generally breaks down. Intel has been mixing it up a bit with newer processors. The i3-6300T in particular has 4MB cache like an i7 (so do the Core M...