You need to learn about alpha channels. Basically: your "house" video needs to have an alpha channel indicating which parts of the image are transparent; then, you put the "house" video in an upper layer in FCP, and the videos that need to be seen through the window in a layer below it.
Now, how to create an alpha channel for your "house" video? If it's a static image, just use Photoshop and save in a format that supports alpha channels, like PSD or TIFF. If it's a video... the only way I know is using After Effects.
There's also a third way, which is with luma mattes. Basically, you create a greyscale image, where the black parts indicate what parts of the image are opaque, and the white ones which parts are transparent. Then you add that greyscale (the matte) above the "house" video, and change the compositing mode to "Track Matte: Luma". Be aware that I don't remember the exact details here: the matte may be in the layer above or below, and the name of the option might be "Luma Matte"... I don't remember exactly, but you get the idea.
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您需要了解 Alpha 通道。基本上：您的“房屋”视频需要有一个 Alpha 通道，指示图像的哪些部分是透明的；然后，将“房子”视频放在FCP的上层，将需要通过窗口看到的视频放在其下面的层。
现在，如何为您的“house”视频创建 Alpha 通道？如果是静态图像，只需使用 Photoshop 并以支持 Alpha 通道的格式保存，例如 PSD 或 TIFF。如果是视频……我知道的唯一方法就是使用 After Effects。
还有第三种方法，即使用亮度遮罩。基本上，您创建一个灰度图像，其中黑色部分指示图像的哪些部分不透明，白色部分指示哪些部分透明。然后，您将灰度（遮罩）添加到“house”视频上方，并将合成模式更改为“Track Matte：Luma”。请注意，我不记得这里的确切细节：遮罩可能位于上方或下方的图层中，并且选项的名称可能是“Luma Matte”......我不太记得了，但你得到了主意。
You need to learn about alpha channels. Basically: your "house" video needs to have an alpha channel indicating which parts of the image are transparent; then, you put the "house" video in an upper layer in FCP, and the videos that need to be seen through the window in a layer below it.
Now, how to create an alpha channel for your "house" video? If it's a static image, just use Photoshop and save in a format that supports alpha channels, like PSD or TIFF. If it's a video... the only way I know is using After Effects.
There's also a third way, which is with luma mattes. Basically, you create a greyscale image, where the black parts indicate what parts of the image are opaque, and the white ones which parts are transparent. Then you add that greyscale (the matte) above the "house" video, and change the compositing mode to "Track Matte: Luma". Be aware that I don't remember the exact details here: the matte may be in the layer above or below, and the name of the option might be "Luma Matte"... I don't remember exactly, but you get the idea.