The Xiaomi Camera can take photos with wider colors, and with the Xiaomi Gallery that does wide color gamut management, it can bring you a more realistic visual experience. Ordinary videos have a limited color range, so they will show the true color of the video itself when played in the Gallery, which is also a normal phenomenon in color management in the industry.
If you want to improve the display experience, you can try to adjust as the following settings, [Settings] >> [Display & brightness] >> [Color scheme] >> [Vivid (recommended)], or use the custom color adjustment function in [Advanced settings] to enhance the display experience.