怎样截取视频中的一部分画面？

我会用real media editor截取RM视频中的一段，但是截取下来的画面是全部的，如果我只想要画面中有人的部分，可以用什么软件处理？比例原来画面尺寸是200*100，人只占100的画面，我需要最后得到100*100的画面。
我不是要静止的画面，而是要视频

需要工具：电脑、快剪辑软件
一、打开快剪辑后，点击右上“本地视频”按钮来新建视频。
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二、视频添加成功，在左侧预览区域会有视频添加进来。点击左下小视频中的“铅笔”符号。进入视频编辑。
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三、可以拖动视频下方左右两侧的滑块来对视频的起始位置进行设定，点完成。这时可以看出所截取的视频的时间等信息。
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四、剪辑完成后就接着调试箭头所指的“音频编辑”，越往右声音效果越大，反之则越小。
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五、选择好导出视频文件的路径，点开始导出按钮。
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六、剪辑视频开始生成，最后导出到所设定的位置。
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七、最后显示导出完成，那么就可以了。
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