What's with the throttle? Looks strange in the video. Check that both of the throttle plates are moving properly when you open the throttle.
Sure seems like a fuel or air issue to me. Like something is blocked or restricted.
With the engine off, reach into the carb and check that the slides will rise and fall smoothly.
What air filter do you have in it? Pull it out and give it a try (temporarily).
If you still can't get it to run, pull the plugs and post a picture of them.
If it won't crank, you most likely need to charge the battery.
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