Sorry, it's not possible. I'd like to be able to do it myself, but if you want to view the camera on multiple TVs then they have to be linked to the same Roku account. The only way to link a Roku device to a different account is to factory reset it. Note that purchases and subscriptions made through Roku are also tied to your Roku account, so if you want to go that route you may want to make sure you don't have anything you might lose by factory resetting the TV. You can check your purchases and subscriptions that were made through Roku by logging into https://my.roku.com using the email address that's displayed on each TV under Settings->System->About.
How to factory reset your Roku® streaming device | Official Roku Support
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