As I was reading, I got the impression it was just a video of various scenes before you were injured. I don't know how something like that would tell you much except what you looked/acted like as a very young child? If you were only a few months old, there's not going to be much on it besides you laying on a blanket on the floor, learning to roll over, eating in your high chair, etc.?

Is it a video of something/someone else? If so, the person taping it would have to have been a parent or someone who cared for you a lot of the time for what they had to "say" to be very meaningful? I don't quite know what you are hoping for/expecting but sounds like your imagination has come to the tape with its own agenda that may/may not have anything to do with the tape's "significance"?

At 3 months, it's not like you were walking and talking and "doing" anything much besides learning to sit up, roll over, identify faces/voices, etc., if you were set back in your development because of your dad throwing you, that's kind of just a "fact", like when my brother-in-law fell with my niece in his arms and her leg was broken. I don't think there could anything to see/hear that would make a difference, at 3 months, other than your life changed completely. But it's not like you can undo what happened or even see what you "might have become" by looking at something about when you were that new/young.

If I were anxious, I'd have a friend come look at it with me or I'd look at the first couple minutes and see if I wanted to continue then on, etc. If it is someone mostly just talking, I would not bother with it; no way to know the context and whether what they have to say was true or not, relevant to your life now, etc.

I have an 8 mm tape of my mother from before she and my father married, probably taken by my father; my mother died when I was very young, I did not know her, and the tape was interesting to me because it showed my mother "moving" and I could identify with her gestures/reactions and see myself in her. What could you learn from your 3 month self that might have bearing on who you are now? I can't imagine. If you are hoping to see your father or someone cuddling you or showing what is going to happen, I don't see how that would help you in any way? It may or may not be there but it is not particularly relevant to today?