You asked

Is the canon powershot g3 x good for video?

The G3 X is a capable zoom camera, but I wouldn't pick it for video first. My video checklist calls for a screen that flips to the front, a wide lens around 16-20mm full-frame equivalent, a microphone input, and light weight. The G3 X's zoom starts at about 24mm equivalent, which is too tight for arm's-length vlogging. The G3 X page doesn't list a flip screen or a microphone input, so I can't confirm either.

Its 1-inch sensor and stabilisation are real pluses for steady footage. If vlogging is the goal, I'd look at the Canon PowerShot G7 X Mark III instead, since it has a flip-up screen and is a vlogging favourite. Read the video guide before you buy, and plan for sound from the start, as covered in the audio section.

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