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Unity newbie needs help with vuforia AR

So I made this transparent video using Chromakey, (used a green screen and removed it with Chromakey shader) and I put it on a quad, everything seems to work fine, and the video is playing. However, whenever the software detects the Target Image it blinks black for a second before it proceeds with the video. Is there any solution to this?

Also there's a black line at the edge of the video once it's loaded??

(please keep things simple as I'm really new and have almost no experience with coding)