I am wanting to buy a gpu that says it has 3 years of warranty on it and I would only buy if I get the warranty on it. Dose the original owner have to provide proof of purchase on the card and I submit that on my account?

I am going to assume you are purchasing from an individual.  Is this correct?
 
No, you do not need the original invoice, but if when/if you purchase the card, make an invoice yourself showing the transaction from the original owner to you and no, the original owner doesn't have to sign it.  That then becomes your invoice. 
 
Register your GPU: https://www.evga.com/support/register.asp and upload your invoice that way it'll be in the system if you ever need warranty service. You'll find the info on the previous link.  Since this is a second hand purchase, the warranty starts on date of original shipping from EVGA, excerpt:

Transferable Limited Warranty (Second-Hand Purchasers)

Subject to the terms and conditions of this Limited Warranty, the Transferable Limited Warranty is available to second-hand purchasers with a valid proof of purchase of the transaction between the current owner and the previous owner.* The limited warranty on any Product which was originally shipped from EVGA or an Authorized Reseller as a demo or prize is not transferable to second-hand purchasers and is not covered by the Transferable Limited Warranty.
Products shipped from EVGA as warranty replacements will be subject to this warranty so long as the original product was shipped from EVGA on or after July 1, 2011.
The length of the Transferable Limited Warranty is determined by Product according to the suffix associated with each Product's identification number as set forth below and will be measured beginning from Product's original date of shipment from EVGA or an Authorized Reseller:

• 3 Year Transferable Limited Warranty Product Suffixes: -A1, -A2, -A3, -A4, -AR, -AX, -CR, -CX, -DX, -FR, -FX, -SG, -SX, -KR, -K1, -K2, -K3, -K4, -K5, -KB, -KA, -KF, -KL, -KM
• 2 Year Transferable Limited Warranty Product Suffixes: -LA, -LE, -LR, -L1, -LX, -T1, -T2, -TR, -TX

Products described by the following suffixes are not covered by the Transferable Limited Warranty: -B1, -BR, -BX, -DR, -RX, -R2, -RB, -RL
*For more warranty information about original and second-hand purchases, please see our FAQ here.
 
You can find further information about the warranty here:  https://www.evga.com/warranty/graphics-cards/
 
Hope this helps.

If the card was never registered , you can register it

kraade
If the card was never registered , you can register it

It doesn't matter if it was registered or not.  Both an original owner and a secondhand owner can register the same product.