You cannot prove an after life with sound or video evidence, or at least with our current systems we cannot.
You cannot have circumstantial evidence collected from accounts from people where they have in some way financial incentive's to give accounts of an after life. So really every one that sells books or gets a lot of views that gives them advertising revenue may be compromised.
If you analyse the accounts given by people that are not having a financial incentive to talk about their experience then the similarities of what they say are too similar to be just in reaction to a body's condition and are far more similar than what a dream would be.
Although a tunnel of light may be something that the body could induce due to its state, other things like meeting your relatives seems to not be likely caused by a reaction in the body. If it were not a real encounter with relatives then why would so many cases have this. When I dream it is rare I dream of a relative.
The many similarities are:
Meeting relatives.
Feeling of peace.
Life review.
Sense of not wanting to go back to living.
Feeling of unconditional love.
Feeling that everything will be alright.
A sense that the NDE experience felt more real than before the NDE.
If many people have no reason to lie about all these NDE's then why would they. Should we not just accept the similarities and believe them.