raman25 - I'm sorry to see that you received such poor feedback on this board so far.
In response to your first question - any program you use, the free ones or the most expensive ones, are only able to use what exists in your video right now. What I mean is this - with any software, you can try things like color correction, adjusting levels, or playing with contrast and brightness settings, but: if the detail is simply not present in your original video, there is no software on the planet that can bring it back.
Hope this gets you on your way!
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