Thank you Sir @saman.ahmed but one more doubt... if asked in the exam then can I descibe the description given in the first video since I find it easier?

I can not comment regarding the marks. It all depends on your teacher that on what basis he or she will give you marks. But first video is animation. Here we presented oxidative phosphorylation in simple way but in second video, we elaborated the process. If you write oxidative phosphorylation in elaborative form, then I think you will get good marks. So, go through the second video again and try to learn it.