I'm adobe stock contributor and I want to use my own videos which I sell on youtube channel. What if I get accidently copyright claim or something, how can I get a licence code to approve it if I did not buy it?
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As you are the copyright holder, you need to fight such claims. You won't get claims from Adobe stock. And buyers do not own the copyright. They can use your assets according to the license.
You do not need to buy (license) your own image. You already own all the IP and rights related to that asset. I frequently upload slide shows of my travel images to YouTube, and have never received a copyright claim, though I sometimes do for the music tracks that accompany the slide shows.