How to mosaic the mobile video to block the picture?

To splice screens in mobile video, you can use video editing software or video editing functions, such as:

1. Use the built-in video editing function of the mobile phone: Most mobile phones have video editing function, and you can use this function to add a mask or mosaic effect to the video.

2. Use third-party video editing software: There are many professional video editing software on the market, which usually provide more video editing functions. You can use these softwares to add masks or mosaics to videos. The specific operation method may vary depending on the software used. I suggest you refer to the instruction manual of the software or search the online tutorial for details.